Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d4d2687759ede0…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 07:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e33d48f6fdd82a0707242b343382eb4 SHA-1: 9bb4df47260ec50f0d08160b8c6eae7e5df3338e SHA-256: f9d4d2687759ede0e2d6b4f211c6dfdd87967c8ecec6831a1f57d11ebcfb5d94
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://migger.dk/userimages/file/80929211623.pdf
    • https://dunaweb.co/bg_image/files/tonerufiso.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/22ad62088569caf8b5c6cbf7e127a045/vifagel.pdf
    • https://zegabilisim.com/calisma2/files/uploads/90486000707.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35a8871516a6b172a66c409fae5d1d94/betuneba.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/302f8cbbb57250a1d49af307b6cefbb6/liwiwixazudalirakifadomi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc2c834f866feef2bf2252ebaaeb7f29/24334990103.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d9e8a3d0a69b9cd007ba8f0cf822b214/55940661937.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/2375443920.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a75c2223---gamevo.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a8260da18faaf2d16622f32f54508922/89458997797.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1linnlmomtc4e9cg5u6m7hbumj/lobagozutasetigi.pdf
    • http://cga82.com/admin/File/83729677975.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/35294433434.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/32158572659.pdf
    • http://alarcon-v.com/editor_upload_image/file/94618079587.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8702909d07---direrajedinowudono.pdf
    • http://obasekiestates.com/UserFiles/file/75478251387.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/33301027801.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e2hvkv47lfqdqj2q1m477vp8cq/wotawomewinazenasowi.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4b6c2f4d830ef70772e130676febeaf0/pidewifixojojovo.pdf
    • http://bong-dem-long.org/upload/editor/files/71448789576.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/80058742949.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/wafis.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f24c1357---baxakixamonafova.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ordinal+numbers+51+to+100
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df45.bin
2de494567d5d451b0a9cebc50b46989af44920978b93218c6d59bdd613f7ba18
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 18608 bytes
font_01_sfnt_off00010d9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
font_02_sfnt_off000125b6.bin
3cb98c88420910da82fcd0ef2cc922a7ab83b43594a4775373ebe29ca784da3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 10980 bytes