Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d6fc640bf09cbe…

MALICIOUS

PDF

108.1 KB Created: 2021-06-29 09:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a040fa1d6f34a52a3db9de2fcc1c5555 SHA-1: 5bd64d7ec7b125396cee33e31241bfc311edf034 SHA-256: 79d6fc640bf09cbe0ed8f7ffa8fa79819f3cbf4c104a6029c3a79b15b82fcd07
164 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a link farm pointing to compromised CMS uploads and disposable hosting, with one URL specifically referencing a PDF file. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://china-zub.ru/userfiles/file/30545943740.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddbfe5b93---zefejerilab.pdf
    • http://transinfosoft.com/userfiles/file/gujewiri.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608046e2468a1---fenezufuk.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8e47920d29abfc820d96b8c6aaa1f56e/gevofinedunofizasib.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ililm1r8cnj1aof10bq2b797jb/wabevegediporedawe.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/50580104191.pdf
    • http://birnagarcollege.in/userfiles/file/pawusiledoridogojosa.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c9f3e028c9df968c7203e02127e84cf3/83793601717.pdf
    • http://7166867.ru/ckfinder/userfiles/files/41941156715.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/13o0pshp35nvhpejfumvuaq752/67423093561.pdf
    • http://chonburi33.com/userfiles/file/dakupubavopazaledebetaged.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70edd975e5---pigifijubexutefuliwo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2db59d893---34220597190.pdf
    • https://aulacvn.com/upload/fck/file/17249006440.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/silg36eb75m01i1pm39vi0k570/rivuwozeri.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe6660c2ae---leputebevizit.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2350ce5d9d6f7770cae913fc24f6ce78/tafuvosubaf.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5ebf9d7efdd21abb77c989fa8f238df5/74902760095.pdf
    • https://himalayanthailand.com/image/upload/File/xosesujosanor.pdf
    • http://dok-vo.ru/userfiles/file/gamegapezedukerukowej.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb67e3549cb---3806681697.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/d8p10qemqnforb3p03dk4es50s/19853704906.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rufus+for+linux+mint+download
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010868.bin
56d88f9dd3a2a72efc9b11b169e407b2a9c5b22f383eb1f7556baa8f7de96d76
pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 3792 bytes
font_01_sfnt_off000116d3.bin
ca110d2172090898f8d9ab0d17503aa03894c1a3b6d482e03ed29346fa7efe87
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 18556 bytes
font_02_sfnt_off00013513.bin
60270f66e50e57c449c170aeef61bdbad5ba2cb5da8265574816f7ebe641543e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 25100 bytes
font_03_sfnt_off00017150.bin
bbc123b096e81f667a6b30de748ffffaa0b9faba6092bb82b84c4cf3db089735
pdf-font-stream PDF embedded font (sfnt) at offset 0x17150 10716 bytes
font_04_sfnt_off000189f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x189F3 16792 bytes