Malicious PDF — malware analysis report

Static analysis result for SHA-256 e780243318a0309e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 06:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb88c4b44e93d28bc72cdf3d097ce5eb SHA-1: 8de6a7026a7ce0d804cd209cee51fcc934d64c9e SHA-256: e780243318a0309ee721acdf7fea437521924ca2d01b688f5b0c8338680e0372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable domains or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://cbgnfinance.com/userfiles/file/xisafesaziloz.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f0e7c3bf---42276465677.pdfIn PDF document text
    • https://network-italia.com/file/63604644074.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/72565843501.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/55730103765.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/29333616979.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/guxunidiwo.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109031838293951.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tarafawijebejupofus.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/87c1a6653fc3156c0601656469722f1e/zimob.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/15246895178.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/86366598775.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/golokofo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufizux.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xisodujunowonomulada.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/gijomegewod.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/dozamojakinepikod.pdfIn PDF document text
    • http://uchid.com/uploads/file/5776675665.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xeniwukitujefunijetib.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/60362840366.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e426046b1---nifotugowidokumabetiwikaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aplikasi+tv+untuk+android+terbaikPDF 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://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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 17604 bytes
SHA-256: d866d09cf20ec659bcfe3e64ba4f35a02c55914ed29fa26d7ae51bd02e199480
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10764 bytes
SHA-256: 8d4090a10e6764ee94db60c3f2c426bf4546d8a93f594771703d76a836a3387e
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1