Malicious PDF — malware analysis report

Static analysis result for SHA-256 55408e324782c7f3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 02:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82adf58d8100ab0816674ce80e57d983 SHA-1: 65fe67a1468fd4351fbbbda87a8c7e2f57bea4d3 SHA-256: 55408e324782c7f3c3ef2136f14cdd3b0a838b0900c053b77bb0eea5e146e88a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7bfe1d5d7b64f63b664fe26a086167a5/nitamajomodupikimafat.pdf
    • http://lamorenj.com/userfiles/files/jeninunazabelako.pdf
    • http://theloanwala.com/userfiles/file/42076649182.pdf
    • http://permagnet.com/upload_files/file/210903121415388002159nsi.pdf
    • http://karinameal.com/imgdish/files/6632261809.pdf
    • https://guruvinodji.com/Userfiles/file/lumeregenakuxowubabo.pdf
    • https://dycmc.com/DATA/upload/files/202109190721529613.pdf
    • http://elitaliaweb.it/upload/file/bimafidenunizak.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613684d491fb1---23115087697.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/64776638930.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a960d8a450d542cf3d5c60e0eee77eed/mapabimer.pdf
    • http://dataprint.ie/uploads/file/70467313747.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210911/16313685415574.pdf
    • http://vinhthuan.com/upload/files/duxowizifuxoxabef.pdf
    • https://harmony-lazienka.pl/Upload/file/woposajapasemivuniluj.pdf
    • http://brickform.cz/obrazky/files/fifanikinizuzarivaja.pdf
    • http://zafirkort.com/uploads/files/19828719102.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/semadus.pdf
    • http://savitaco.com/uploads/images/files/bekavumepupapokome.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141123a6fd75---60585993967.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a49cf810e7239859449448a6ea44fa69/deragasavajizifan.pdf
    • http://posicert.com/upload_fck/file/2021-9-9/20210909191437114697.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/wazazubazinimuj.pdf
    • http://flyingfish-stay.com/userfiles/file/17810135407.pdf
    • https://chennothinterios.com/uploads/file/bisuxolesidowaxofupuwu.pdf
    • https://ojazzdance.fr/userfiles/file/15201845094.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+ipa+to+apk
    • 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_off0000cd26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 16792 bytes
font_01_sfnt_off0000e53d.bin
ba01fa392b63fd97b378183809a55e864bcfeb7b01c1d0c7c6255c11592eee30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 10220 bytes
font_02_sfnt_off0000fc56.bin
3eaaf9b0652dfe06d1ca85644a3a2498c39794663509e9d4815416f32ea8eab5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 17828 bytes