Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ca76918f82a794…

MALICIOUS

PDF

88.2 KB Created: 2021-07-14 07:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba8b0d5f9070644e8cd50a61cff09680 SHA-1: 0b0e47421fd71c731af44b321c98838cd0da2cbc SHA-256: 43ca76918f82a7946fbe3ceeba3aea8a0521a7943f3d124a3edd459d1c329f8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to malicious content, likely phishing or malware. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nomylo.ru/uplcv?utm_term=habitual+offender+law
    • http://vasvaripalmuzeum.hu/upload/file/99975006587.pdf
    • http://younewstoday.com/task/userimages/file/5944546874.pdf
    • http://ndt-tl.ru/upload/file/14605309766.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff050d244b---11977972573.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/sadafikugalurugul.pdf
    • https://taevlingar.se/images/pages/file/betamuximivogosuwolaze.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56596265326.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/85u57jn00p5hqtq7js4pfiiagv/vugexesokapefefo.pdf
    • https://newsru.md/upload/userfiles/files/fufuf.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/17791532970.pdf
    • http://snap-drone.com/userfiles/file/2658292568.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c570e861dcc---gigotezonasem.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1704dceeb029aa4e49c857d340557771/37781317219.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/bcdeca6c1b680208d2c3a538ca2f2988/65414964577.pdf
    • http://dokumsuzgec.com/userfiles/files/55463975971.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd8acf7c1---4399414765.pdf
    • http://fiumevivo.it/userfiles/files/30113214889.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/crlkvq1b757rm2tv32jemo7s0h/xexipomijo.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bb6e5386caeb98ce7332a3c2b27be7ee/51342991132.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd89baa31---66597686936.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdf
    • http://retco.ge/ckfinder/userfiles/files/30445860383.pdf
    • http://eltonltd.ru/sites/default/files/uploads/8418512899.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/68grsbgsupev4avlprrsjjm0a4/13233952255.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42a7308a2a4db4e77c8ced53d54b00a9/wosaxabasi.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c06fc2ca995923c2bbe8e5d24112685f/61467096895.pdf
    • 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_off0000f4b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
font_01_sfnt_off00010cca.bin
f2d347235b2d66bd9bfe5ed22bc0c1bf05b477c7c23ae4ea26792c50f1aa0ca2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 18384 bytes
font_02_sfnt_off00013b9b.bin
47c5a3ea7cdfa09211a3b28df6cbc3d736b558f6ab7c909479be4c1a0f14b1a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 10496 bytes