Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86f327b63e4386f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 21:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc1bacd07f551494151d926070e9d55b SHA-1: 1c1ec119c504f9d1314366bfb9dd9f7af4fd0b2a SHA-256: e86f327b63e4386fe0776a67c836583546c921d83eb457eceb2da4732fbd4623
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a link farm designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=best+vr+games+for+android+without+controller PDF link annotation
    • https://gberwanda.com/gbe/useruploads/blogs/files/kuvojofinigarazabaworipo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/zusosiwaw.pdfIn PDF document text
    • https://somogyplusz.hu/files/zidota.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87658494974.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/9066067566.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/solotawifosu.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/65448459256.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161442d1c84028---vefusiravamisiru.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/vafod.pdfIn PDF document text
    • http://surausa.com/uploads/files/tanokatorokomani.pdfIn PDF document text
    • http://schokofontaene.de/idata/76237561544.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d96o420iuu7jd702djmln2ioq6/pefagerowoj.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070420246192.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/88924473288.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613106fbd8b09---86893528426.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/nivexuxepovamumarolafigik.pdfIn PDF document text
    • http://araonline.hu/uploads/file/letarupupoxugimofukapizit.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/44916879525.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/darafiritikaliwogubif.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/96567221599.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_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11228 bytes
SHA-256: 484588f2aac64b565d613b0bd4d5e9f56e3ac0764b385f69abeafad266b62e2d
font_02_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 17600 bytes
SHA-256: c6f9a42bc879d44db8bcea747a8f175ce872f86437ced7523579d24b017d37e2