Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90540e343f5634c…

MALICIOUS

PDF

121.8 KB Created: 2021-06-22 14:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3435b46e7fbdb09cf2c98fe7d3c4f5e SHA-1: 21e782768030f194078fc972e1d535585ce9573b SHA-256: a90540e343f5634c94f43d660a5991a65bc5dc0c5a967829e55605770f6b2c36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077769d18e4b---2784837160.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9a74031c9ccfcbbe6acee6896f5804a8/87801640005.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6c8486079---joliwa.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/62970877757.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mejotuzowanobaju.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/096d0316a3a51e210a5612b70047b282/ruradudotimovuxaweva.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31aa698ed---dobesujimivumewa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085e49a8f266---pumuwepifurulifeloxav.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9202911b04---79628876739.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a1a2584f3dc4cc36a05e7d27848c7ee6/vijujetezoginuvo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3cfaca0b6d4fa09c414ec7c853b9b320/80894074945.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/49795066259.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/doxufokolevegelidepesud.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fb90037a02a06491a7141d80746c6a4d/tilupeviboxekitazefoxi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc76df1d720---13908394301.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/lodotirufuxur.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/33939243299.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fxguru+unlock+code+list+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016305.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16305 10468 bytes
SHA-256: e0b4ea77728c0876a57ffafbf60491659755fd4e39148deb5a821916500696e0
font_00_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 5192 bytes
SHA-256: 1516804d9174fd63d2c8c659b57eb5df42d2226604ab4567e8a6d3726d3df6a1
font_02_sfnt_off0001510a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510A 5260 bytes
SHA-256: a81d7cc3eaf7221c1ec64b309271a023cdac9380df7f205c5ad2d2fa55cbe891
font_04_sfnt_off0001808d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808D 1756 bytes
SHA-256: ec41a79c72ab94c267481c3ab7b23184c98007792f761493d95c3ce713e1559b
font_05_sfnt_off0001893c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1893C 18680 bytes
SHA-256: abd7dbe12a0f552b2a69a7cb420fa1714ba9d20b55f5f4928307033871dd3810
font_06_sfnt_off0001c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0E8 16528 bytes
SHA-256: a82a688240c566b49a9e5d3d75c0208d4c2c3b9826ca479e58f686852c6e32c3

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