Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5b14e5f20096a9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 20:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c8184289e6fd2b47d51e194089490d4 SHA-1: cd40a712b652892206e0d1271e11614faeab29d0 SHA-256: ca5b14e5f20096a966310ce32e423fe8cac639a0f7f8a6e43d142222bded50ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination by using multiple domains and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=how+to+create+a+workplace+safety+plan PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1abrbv84dbd138vip57ntmhjko/sumamozezuwikanixi.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nenunira.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zepotaje.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fd05313087364918803497370ee21abe/57938035691.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e953d2edd5---34636612638.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089af38b8db6---latixo.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/46613782028.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c740f68d9cf---zuwefatigedulolaguvusirof.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a702caa687288f06549a5029f96d786d/33969191115.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/84bb389d11ad2971cb6d07518273318d/nupubifemeku.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/79259860632.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d352ad3a34e0f66242458d580a2f5ee0/47494655895.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607970c9dfd67---97143904486.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/92455355000.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/toguxafusisa.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tk64oj3nvf8em87mcq6s10qrbv/lekotesijifi.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/napibefojizunuvedebitu.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/17628045168.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/diwejisenaludobamodif.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/84401720775.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8836be261---zokibuwu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d6a9bc3f---15503130897.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5365f414eca82b367667fd2d49686425/53059221844.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/19832271724.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_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10664 bytes
SHA-256: d6ecf1d79d5549431f79ad1ab0c68f250307494072ae3ef096043a7e3a89e765
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 16944 bytes
SHA-256: 39be3b57a7d730b6f2255e0e1474746d9e02d5f094007c196f9ef13ecced27c8
font_02_sfnt_off00013ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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