Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f0a19da2f97b26…

MALICIOUS

PDF

97.5 KB Created: 2021-07-18 14:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d590fabed2a384fb12a771090a4aa505 SHA-1: 4661a6431af4fdd4b790a8e7c0a0bdd731d15b6a SHA-256: 13f0a19da2f97b26e64321234166c31cbc2a6270d8dbfc7deab96e461a2ecc75
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb5ba00476---79798095247.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/215b3767d8e63a1c88883cefffff5ddd/5472569963.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2de2fb79---18161868123.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2de1aebcb---xutabosiv.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/18962429916.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8ff5bb093---19634620536.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a720498703f---bodarifuluwazifube.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86463e394c---11161470007.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/aef0960b2234d23ad5fbcddb190d3936/67947363634.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cd055687adca37e564a546a55c610850/48727691281.pdfIn PDF document text
    • http://funperm.ru/content/file/72746068490.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/tarawe.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/dutofamabifixomer.pdfIn PDF document text
    • http://classtool.info/upload/files/zedokelo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f6b64ee---34428969190.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/83055674662.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b527e8b4126895501d9a197cab19b07d/67592714816.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bdd4306d6544d79e880c4e6f398dc5cf/xuzadajegodadagevodotase.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8fe1e4881---18728332417.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/lojinewarorukipuxifu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5accec12ae6a51ea40598e4da65ea689/wuzenumuri.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b861q4s2kmvusenoorqeoqtp94/34798080974.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/54c1194d6eb9e67a664e69b5b545c32e/27594080369.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c58015b3---wubonopojokexile.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/1349268274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+legendary+meanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16948 bytes
SHA-256: 3a146274ad57c1a9e6a1e8fd331b7607da2b01f0a801bbb7b2c590cf70e115fa
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10712 bytes
SHA-256: 69d0370c750d1e1b139501863488549a06c510fd75d1ac967d3b0de92c288f56
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9D 2816 bytes
SHA-256: fdcc954fa3d5571c9aa5664c6f7c5087dfc696f4a1f836c64f4109b625db3241
font_04_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 20096 bytes
SHA-256: 40a2f0dc864aa667bb2014f6cabad35cdf149c0c300c419598363830585a32c0

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