Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3c4cf236ce27b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 17:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7a38c97311985e1bfbf2397e0a61f68 SHA-1: a39a6608b71a896ac32ceb5d4d70ee6bd07a26fb SHA-256: 78d3c4cf236ce27bc03badfdd5d451f8aa8d81d7bae9a6eec4307cce0ac8d54f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures that likely lead to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=the+obsession+nora+roberts+pdf
    • http://prime-standard.com/piceditor/file/90150631978.pdf
    • http://aliglobshop.com/userfiles/file/38258170790.pdf
    • https://bmw-zona.ru/uploads/file/juwetaninigodulosixax.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/92a623788c6b50a2158d4c97144d88fa/situmewatixuvebejod.pdf
    • https://xistenze.com/files/files/gulurasetin.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/05etvkbskvakb9o6s9q9552dkl/berenawejoga.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8e671f4d4d57286fc5e3d1c9d01fe2fe/13502434350.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c180eec548d---18889577749.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/774600f5b04d043d99cc17f763a33429/repazujil.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9safpqdffldn0ldfgbev6p9677/jizixerugakon.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/046d503c86bf726fe57d7dc0480f4a6a/59773587349.pdf
    • http://alpha-th.com/userfiles/file/losep.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/07fb012a5ad032fc321864f0b02a3fd0/webelotiwagutalojibewigut.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607223199b854---90529378853.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/povojenozuxi.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/l22jl72apvnjunaeh58kpcv852/dulurupatesilawebumuwab.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160817367ab813---tabowifizodasagaxajuf.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e6a0577---mezefiraguxibumoko.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/taxivuxisiwonip.pdf
    • https://africanresearchcenter.com/userfiles/file/jalisifuvepudezeniwi.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/juvefoforalobamameda.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/22292441764.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088258264cad---1469356850.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd2cb69e1---seweduguvutakosina.pdf
    • 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_off0000ea43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 16792 bytes
font_01_sfnt_off0001025a.bin
359bcb239ebc0c6e9a60557f2dacfbd03cfccefc6335e5c26dc9d7fd30e170b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10652 bytes
font_02_sfnt_off00011a6f.bin
df45ebcbf13226da198387c5104d28f860ab92753fb1e28b86f01194908b4d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 17540 bytes