Malicious PDF — malware analysis report

Static analysis result for SHA-256 762923d1931c4b2f…

MALICIOUS

PDF

95.4 KB Created: 2021-06-30 09:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7ff8ffd6177e3d7ff11214679fd458f1 SHA-1: abe437c6660a440dc6998beacf2328e10f8d9b25 SHA-256: 762923d1931c4b2f4169ebb23e96aa8cdd571834f4936897f131ffb08bba570d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. This suggests a multi-stage attack, likely aimed at phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823ecd3db8e---93982485205.pdf In PDF document text
    • https://blugarden.eu/file/fiwiw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c20d7frlcamecj5s5obqe13jiv/vogipavoxibo.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/76522940488.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/065d4efa239195f619518a3339d5f6e9/sikutitedudotuka.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/dalizafimijawisusasesuk.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b3a88fc7b9d6d5ee87afe60bb5cce034/ganaridebamajesibewin.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/033224abfa076820cb052207249cc7d9/30196620964.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/35f005172fca2b40da2c1da347502e5b/94184898211.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/881b33d80921265fc36ff660cdc7393c/wozunazega.pdfIn PDF document text
    • http://fygl.net/uploads/file/091435547231.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/894ee5b73328655b2afaea488211551e/razozivekevizufuzupe.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d72f35be---59569237022.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/romaju.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tuzibolus.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210610003723.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cb7tm16f94fvh3pqbhhe2ug1hf/54470356600.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e643c066dd---26606721855.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/arle0ag1m0b0tjl97lbtooiubp/juwelumaxapufuf.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e153fbbae0---putinolijazuzedujowozo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/94160922865.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gajilasisutezifalulini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=exponents+with+multiplication+and+division+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17860 bytes
SHA-256: 4716195be3f47238b2ed00224b7022eb63e20229465b276ce01c5d8aeeab5c92
font_01_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 11208 bytes
SHA-256: 0a090250a63d88b76b268edfeceb26e31c604c08846264a8c30a57db38e09c23
font_02_sfnt_off000141ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AD 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000156f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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