Malicious PDF — malware analysis report

Static analysis result for SHA-256 877f59090d150acc…

MALICIOUS

PDF

75.4 KB Created: 2021-07-06 05:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 560c1ce31173419440f88dd246227b22 SHA-1: 68ec157fa722c758752eac2303028807818591b0 SHA-256: 877f59090d150acca5831e80e32b83aebc16487a2285b8cb1d812f4cf7d1ea80
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm or phishing campaign. The primary attack pattern involves directing users to external URLs, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://garglob.ru/uplcv?utm_term=bash+scripting+exercises+with+answers PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i43acodn1cg4lc78878kivrhm1/mutixanotimoti.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/63723605078.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/jemisinulosifevokewuzob.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ecdc5e59d0c4a3e9f9722145191bc5ab/zepiwekuj.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vufalevolevugusimajodo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/549f99a37210a64310664321b7c817e9/62087177077.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b21dac7a5---situziv.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenipelugo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11b9370508943ece1e55d120bcf163b0/vagisuzisegutimodakeleve.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d816acf8---1412514717.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb83a3f50e---vowowotubekonovogudu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vatogopud.pdfIn PDF document text
    • http://technocom.pl/editor/file/bozadewukemufabutoregolu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c069c729---10580234377.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad6714b5---netaveluberidolizumi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejb6l7o19p16hqtn4vdggd10td/41734220058.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kivifotusowubivemowanowad.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4652e79a0---zevidekabaxibamuj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ad67b3af09a5faff8f020e198071ff17/6282380123.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/l6bt5jpfaatvn02dsofsro17g4/68993860644.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mabr5u1htq72upi52j7gu5gr1d/87262420220.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ziwabonevebobajove.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815fe068b6---xefewobo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/99903244978.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0526d84a---16159870089.pdfIn PDF document text
    • https://naoshima-habitant.com/wevuzopifo.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 17128 bytes
SHA-256: a93dc948a39190dac0e640604477867ff468e63560487b9bee12cb95e9597b43
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10728 bytes
SHA-256: bb5c9496567bc8694b497dd68be72a8fe974c54afca648af843c3a19c2579388
font_02_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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