Malicious PDF — malware analysis report

Static analysis result for SHA-256 932be573c539db3e…

MALICIOUS

PDF

77.7 KB Created: 2021-10-02 09:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19b41e1b9c3c07942cdb4038b75ef683 SHA-1: 3696fec68c8c9abea057ad47dcb3ba34df56f89f SHA-256: 932be573c539db3e2a878e72a5355b8ef971e39f303b9653869f0a1fde2d8459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=the+meaning+of+doting PDF link annotation
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/furojoturevikor.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/mepoxevubuxirixif.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/fexurov.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ceb47712b---42028371803.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lexiwani.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/9816081118.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/wegofifoxezod.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/simikadefibedafotim.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/36319714738.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358269f958---wizogopiwekosasumupi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/33498059142.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/motamedejepe.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/laxavaxiloribebutaza.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/d6q8hsmrdtb1i9hn7b2c6fdccf/64128045811.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903135600557736do3pgnczwkjx.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-29/48209cee8a7070db8fcfab15766787c4.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25206122877.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/97897827640.pdfIn PDF document text
    • http://autonoleggioassereto.com/file/goneravojuxipelumilo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/gejum.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/67756420859.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/rolawe.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/51233447725.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914103737749664.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/loguwomabikifijewa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 10452 bytes
SHA-256: e307e95e9990842274388cb8a5451ce49e158ef920f6e45a3b10057ef5b99ca8
font_02_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_03_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_04_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 15328 bytes
SHA-256: 4ad0574eb28df8aa472e59d6f3d1417d343f0634e657707be13531482c5e659e

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