Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b51c4b2b4110b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 08:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f328f32b701bdef6434305323403282c SHA-1: eed3ce98713832ea257e77e4fcee89ea27ecea53 SHA-256: ab0b51c4b2b4110b84c98dbe5c023ef05d095c3c30f873d30e2cef11ec05505f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user interaction to navigate to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=formal+languages+and+automata PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd429529fe4---vuvejakup.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/pazedizojevabebepo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i488aci3robcf6ikmmgld3qrnc/vulux.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae9mmb24jnulatusc2tqlccs4v/retalinu.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/gixowoguv.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf86ae461---vutivafojufifuramaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f34d48860---71731826279.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/14923234130.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ee26c29b---87545446334.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/pizexozaxerota.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/raxopavufawosazisiwimi.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/sarudopomenujigiluwekeji.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19296731770.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f2590adc---61571468014.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93256437834.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7a592db85c383736381628608ff3d744/bifixedorug.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/c530ee27e0n2d53h8qqdevi5ji/xejofinem.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2c8b9d79dc4f0bb6335a0d93ba2195d2/59273652331.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d215a54c---38121490496.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/jovemi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b41102890b0---13036169385.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fowoxorizerozomivuku.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/dccfca88b89bdbe1fa7f35d95f3f3497/lirebegemes.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d913eca0407---35257327466.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0f183a813d1db95348dcb3ac88acf24e/5495341716.pdfIn PDF document text
    • 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 10576 bytes
SHA-256: 26e7a881a2261f3ef4c728e044944d6df6a6bf7a5cbee3b3c3e60d1035eaedc4
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 19420 bytes
SHA-256: d50bad584cac35c054ad99e970c631ae1dbad37ca2ec974e4871d88ac163986e

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