Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4600c36330a618…

MALICIOUS

PDF

98.9 KB Created: 2021-07-19 15:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58ebac3bfd89a42cf54dac6795ea565e SHA-1: 9a2bb4d2109f3d0b298db9a6a1a09bc4d44b8529 SHA-256: 2a4600c36330a618a2913f9a0131df7a3e51ad66a1319979627134d74c935c3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bangprice.combangprice.com/beta/cms_image/file/volupu.pdf
    • https://dolcezzecaffe.it/file/7239572283.pdf
    • http://dunajecbiala.pl/upload/File/86215658519.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ca94ee1e7f1d24a767b790301a013c1e/batekobabivilewedanaza.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/m300gs8japfsf8tplaes7u3r70/nowekup.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/96986760652.pdf
    • https://dusunceokulu.net/resimler/files/melenuzewedamupilure.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2bf2388d---31270746899.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145dc6c366---balodogivalofozij.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a43848869---kaxetixufi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6q5a9911lkdm6f0db4iiud5i80/61369172832.pdf
    • https://accuratesearch.com/userfiles/file/xipakigid.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/lijalozifidafukoxi.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/jitupojajeku.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea188e02a---13780220102.pdf
    • https://tsydesign.com/userfiles/jws/files/rejulikowasesasis.pdf
    • http://mikailang.net/userfiles/file/20210528014955_612189060.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822863ded49---jiwilaxotawananagavijad.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac6d7987a---20296262598.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524aa2e44a---42084977859.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+old+blood+out+of+clothes
    • 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_off000120b0.bin
74cf3ffc29a446f18240db21b027b9fb494ef130d4dc292b62294049f67a5e52
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 10616 bytes
font_01_sfnt_off000138ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138EF 16792 bytes
font_02_sfnt_off00015101.bin
33b63e6b8c6529da4757b290c0dd980d8e97411239cc64f307e9182ed01e19f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15101 17748 bytes