Malicious PDF — malware analysis report

Static analysis result for SHA-256 34448f64aef6db44…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 819c022915fe026bf984c935a3ae2821 SHA-1: 70d3b646baa3d5181da56747fdb9605b83eb29c0 SHA-256: 34448f64aef6db44f03cc9bd3756aff518001a96314816e8fc73144adda7c980
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. This suggests a phishing or malware distribution campaign leveraging a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bd8a0e99fd39ee5001bb4462e3cb8f96/47557578757.pdf
    • http://php-lounge.de/userfiles/file/24931419654.pdf
    • https://my-natural-style.net/upload/files/fexesemizud.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/075cc6ab689389160baac64db308bf52/86860633921.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bfff1f18---72624639456.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7cd975d225a05345d4ba045cd3aa2ce0/38326740893.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/456332472bad20d15c750d6435236a57/pakosemuzuraxigodu.pdf
    • https://qnzar.com/files/14880230327.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/puzutiziwaxawedipomageg.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67265546446.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9848922550.pdf
    • https://tramtron.vn/uploads/files/files/46391814266.pdf
    • http://autohondl.cz/userfiles/file/80506277569.pdf
    • https://topinsolventa.ro/userfiles/file/milas.pdf
    • http://homenet-spb.ru/userfiles/file/duzaletaluti.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b6ca6df4---75395853699.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f776f1bab7183b037072d0b7bcfa6474/87918018231.pdf
    • http://china-hold.com/UploadFile/file/20210516204441584.pdf
    • https://superpart.com/files/luropenimuketobazoleli.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/busisex.pdf
    • https://scriptdd.com/_file/file/88583863283.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63da56259---welimen.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f2a45a4b77992ff8f9c310ece1cd374c/88363116770.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cd30becb2f606c80d5c4fcdd5af1a54d/gupazetodifujupizef.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/862lrl1br34pgchdco85r63ee6/16225781646.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a3af6f4e25f6939a6da230400c4cdd40/zufudojumogexeberexavojum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+many+units+in+175ml+glass+of+wine
    • 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_off0001011a.bin
16f838a47a1d84fa20527812fdc280617aa6f59a200e14ac72026b7375689ce1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 17028 bytes
font_01_sfnt_off00012d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
font_02_sfnt_off0001452b.bin
c671b1fafd382a593f3a059bfca8849cd00918018cadbd305eb83a02f8d8e390
pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 10984 bytes