Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1264f0ec59d8e36…

MALICIOUS

PDF

104.6 KB Created: 2021-06-26 16:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4dbd38d88b07da642684371a0019238d SHA-1: 7266ec74ddf719a084c2fcab9689bb9871936a72 SHA-256: a1264f0ec59d8e36e826daf4a593776a498b567d66e24d452958db5081a141fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document's purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://maxflowfans.com/userfiles/file/bewevubitatibesakidetoje.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/rililovesuti.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52a891d3ed5d98830a45695cba0ce129/sobuvefapavatiru.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160862617cd617---58120046120.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/bugukuvalarenemotan.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604094458533331.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3847eb64---33216629022.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/12898126145.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855de1ac6fa---bidanikotuwojogo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gorotagewulewaku.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab216c454ebf8a5150cdc1278ccc230d/fupejalaforurezowafubirot.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0iae3noqv4f10jhhfducse3juv/dugotumubum.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9c6119d2---53163811335.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c0dbef0de538788e5cf0d7800a44317/75368638976.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0a04262862c52cb9ece663fd92da437e/25481659002.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/77212681286.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e47973a6a---ximagidetumaxawaguzabukin.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9209d3917565e78b683e344b817c8917/72013354865.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8262682d1---46462005917.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/28804106248.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9bd23b2cada38b4e2fc0b2da1cb5c2ff/43993098140.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b18ee729e---feket.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ada941aa---juvuzuvibo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce69e84ea9---xadukudajufajuliridad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=timothy+olyphant+anderson+cooperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 18600 bytes
SHA-256: 238bb778ffc7eaa8992499f6d9caeba38fed060aea02bccad8065c21efb89a2f
font_02_sfnt_off00017c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C19 10856 bytes
SHA-256: 0947591374915a988817e7970a45906ff11e1e85156f63a6d28a4bfa72276f3b