Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d58be80cf89aa77…

MALICIOUS

PDF

92.3 KB Created: 2021-09-18 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 822b8470a1199f5f122989896b8d732b SHA-1: 0566ad5c3b417c8e0de4b1623d202a49bc559915 SHA-256: 1d58be80cf89aa77bab9ecbb575bc65026c3b2307d1cabda192dfba56e57c6d7
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to solicit sensitive recovery information, such as private keys or backup codes. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://harposwebdesign.nl/app/webroot/files/userfiles/files/pinamadurazumodabokata.pdf
    • http://reliancefla.com/admin/images/file/65462880873.pdf
    • http://red-persimmons.com/upfiles/editor/files/tezoresikitebikalekolagog.pdf
    • https://ww150005.linebot.net/upfile/files/20210918042004.pdf
    • https://toptenstudy.com/upload/files/BodyFile__613254D37D250.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/114274872.pdf
    • https://linhngapt.vn/upload/files/wapemame.pdf
    • http://nature-revive.org/files/file/xevejowezewijoxurogoxofas.pdf
    • https://nslogisticservice.com/userfiles/files/77151098648.pdf
    • https://futurefacesmiami.com/uploads/file/susaloko.pdf
    • http://mstreatmentadvances.com/userfiles/files/59635477294.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/wajusa.pdf
    • https://rajaketiga.com/contents/files/23193318173.pdf
    • https://mar3ol.com/Files/files/jodumedetoxox.pdf
    • http://thermcom.cz/userfiles/file/wugobefaziwepixas.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb727d55fa---lubinakiromarugul.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/675dab2eaf2c2e0d029c1876eba6d3c4/95574849905.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mupupabolobokig.pdf
    • http://lt101shop.com/userfiles/files/lanejesusedetigekugara.pdf
    • https://rugsdirect4u.com/uploadedfiles/file/zukopapefik.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451a168e8b5---62839613623.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+only+voice+no+keyboard
    • 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_off00010222.bin
4f35b3e4821fb7e84d0072676efc8f70d9a641415099c9782cca77c9b230afd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 18896 bytes
font_01_sfnt_off000133ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
font_02_sfnt_off00014bc2.bin
a803c45e4486bbed8270bb462be98bf64485267d96fc7f3c68bba44f007615be
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 10492 bytes