Malicious PDF — malware analysis report

Static analysis result for SHA-256 610e6b58a8f0de34…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 22:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: caea9a1ba6609083f9a28bdf9a4062d6 SHA-1: 022298ddc6a8934eb112221c28a7848b14b0d590 SHA-256: 610e6b58a8f0de347fddddc5b932cb0c16429e7bfdbebcc2a9654a0002eeb3b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. This suggests the document is designed to trick users into downloading and decompressing a malicious archive, likely containing a secondary payload. The presence of numerous external URLs, many pointing to compromised WordPress sites, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=pdftk+remove+password+protection PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fd9827a67---23918750309.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/79714293048.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/28894675734.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3a40aecb655e73e9e5e8b659f7563589/mukegeva.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2069a934---23910334222.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/zudusivekowuredopanewa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612d9b8013138---fadoxorigotunida.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb4e727d0---lidatorewalukiwivok.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/lowerikoj.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/bisukaxudorawepenuwedulu.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/virokimomorab.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/mubepalafazufedo.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/sowiruz.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/rikejumunepepututetob.pdfIn PDF document text
    • http://gibisch.biz/files/files/lulimibapamegibigi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b3100c98f---danakesifojerenene.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pozudigifavi.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/54064588885.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/jupaxuxotom.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/91bdcbf94aef06bda8cf64640153d9fc/19386968178.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161055ff672963---47445670867.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f98a30846---raridafuloxo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/836269433d9dea2f118547b7e1b8b667/lefisope.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/tip2ohn3e695ed3b71ba85bo83/64298855047.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/77912444718.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 10980 bytes
SHA-256: 96e9c51e6c4b846229e96e0f7467ef9fecbf8bd29bbce327d58728a0d7c35b64
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 18020 bytes
SHA-256: 13c7b543e79756a45fc86387979657159c4b946075c22d85e659ad242334173b

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