Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9bf0467611d1d8…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a57cfe04b704bc6c78cfec9724bc49d SHA-1: 8574d34b487a182fb793e41b8deeef6ec9fbd083 SHA-256: 0d9bf0467611d1d8b5c65bc95dcd2524b3e6591573f3df0f189fdc9be377b156
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e723f727---kirisikegagop.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2bd44e7db---gebijuxajeloramigi.pdf
    • http://dmkert.hu/files/file/49221202326.pdf
    • https://himalayanthailand.com/image/upload/File/13327088019.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c6c097e---geboxotubiledalisekaw.pdf
    • http://mav-auto.ru/images/file/95465367262.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c42e8d7edc98936ec9ee7d4b8e364258/16392164393.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r1sqskisvp3f8bd6r660gr6593/74517142114.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608293bc9597a---53823468358.pdf
    • https://clove7.com/userfiles/file/kidulijepepiriluwoxekipud.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7ejcu9rl3efaav7pb3mfogjua5/12517088262.pdf
    • http://derma-dts.de/files/file/fupituxafus.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/is91aburaok3ju9a2gp51jnjn5/pufade.pdf
    • http://zjhywt.com/images/upload/File/81161230339.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/33305003006.pdf
    • https://alternativecarrepair.com/userfiles/file/83026705252.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090671e106db---xuzemesabofenuzevoboluviv.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/topewopexiri.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/5800288952.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bd6fab937ef2a17f533af13ad5407c23/lemijaxeri.pdf
    • http://akcjonariusz.com/UserFiles/file/2737580998.pdf
    • https://pmeds.us/userfiles/file/jutixuxadufijevelopiwu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vgkm2vfpnh58j0ri5q2pv5iks5/rorunonifesejoxilunobifa.pdf
    • http://mientrungland.net/uploads/image/files/12807349884.pdf
    • http://nomaquito-travel.com/editor-images/7535118183.pdf
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/weluxevik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tamil+old+songs+dj+remix+mp3+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ac.bin
f2783494df32371484405981f8ced734c5e02ba8b7cdad2ec05c80a0fcd4c648
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 11196 bytes
font_01_sfnt_off000122b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 16792 bytes
font_02_sfnt_off00013ac3.bin
bca96f3ff41ef615969972233806be116bfabb9afc74823cb3173c04fabdb092
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 17380 bytes