Malicious PDF — malware analysis report

Static analysis result for SHA-256 780572d7e9c63823…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 02:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70d351cc18b675a72192979995021a89 SHA-1: 751c8f42d1dd760dd35fad422b922bc5844fe5ab SHA-256: 780572d7e9c63823c77a497e38c99b1b12869adbdbd01acde75a0deff3cfd3a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The PDF's structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f518c9ab9e---kebasozadam.pdf In PDF document text
    • https://conrays.ru/f/data/lijedukopepijirojip.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/96369916125.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/mijoxuzovojitura.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911203138010.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/ripusifimoretutijasamob.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9673d5686---pukiwimukegedejolas.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210917/file/43135750117.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/94352833760.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/66783005484.pdfIn PDF document text
    • http://salt17.com/userfiles/files/daridinuvufobozozakowagot.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/58189280565.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/21414979526.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/50322881072.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/vaxemodunimipulelaxogegug.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/96631642134.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/siremeg.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/funikidox.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109110158251751.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/joloxajuxiw.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/17769378748.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144f731b9e67---kazabevazutajedopid.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/46033011746.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/piloxolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+a+quiet+place+2PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 10692 bytes
SHA-256: ea4f19a569be4a11bab338df1266c9014b18f92057885f2ef9a8c5589fa79bd8
font_02_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16516 bytes
SHA-256: ec6eb77ac9797ca1cda77268d562551d2d3b0ae044ec636de4408a28db55f4ed