Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2ef40131011848…

MALICIOUS

PDF

69.2 KB Created: 2021-09-07 02:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 193231876d5ba37ff6980b5180d5f502 SHA-1: ab9607278dbf0bcf1f28260160ed2a4a0843fd25 SHA-256: 5f2ef40131011848aa4582b5f8edf9ff7e5f973140e68184e0f8689134566a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual content for analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=autogyro+mto+sport+manual PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/115f33f16ce39ccc6ffc276baddf8e40/83790080353.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/kitiwavejefopejesij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c8f4059---27012457603.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/14039946278.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/wukazamiwidez.pdfIn PDF document text
    • http://funperm.ru/content/file/65799913166.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/34618035677.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/36323093582.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c8115cae2079a7026c3976048ac36abf/pirudulonubodikikarukux.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/12072431801.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/76534734556.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/16385534830.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/hb0l5ek15eqd8ekjgdgiramp8v/49399690629.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/66781875969.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/78405938150.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/45003113755.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/8640929704.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/38403520475.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xewukiwuwifegepaw.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/sosowimebuwusofuvivapatas.pdfIn PDF document text
    • http://www.77ice.com/upload/files/54680635142.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/shplcrtig132pqeg66sjgpgfgr/93453014093.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0c553338---tepuro.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_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 10564 bytes
SHA-256: 7cc8626b802558175d57adfbcbfacfa406a3c38b6eac29ef85c2871f318682b1
font_01_sfnt_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 15252 bytes
SHA-256: 80a9cec0e49d9701a401ee8d79385c32a4fce3cc6388e7d802829e5e84219c47