Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12f7567d59a512c…

MALICIOUS

PDF

77.4 KB Created: 2021-07-03 00:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 995bb29b5e637b59f8fc620add36f243 SHA-1: 34a1f6ac434a0a79161748fa89f8df09c7ee4cca SHA-256: f12f7567d59a512cd0bcb48d628dec9b2237a8dad584e946bc8ba69cf113fdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5cd51c89---xozitijobesupasuwokemog.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gl6un97ag9bmssm27tlo3p5cos/23491097536.pdf
    • http://marketypik.pl/zdjecia/fck/file/53573608183.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/fjns2d43qdbr8kaaq2vi9hlnqs/45953385196.pdf
    • http://henri-ruch.ch/doc_pub/file/34854388820.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160aa965eac5cd---fijiwoluwiwikinago.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f643212a---93285080676.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c34131a54---laziwokizabulubavadenuzu.pdf
    • http://pressvaluation.net/userfiles/file/benewunur.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91570da7e2---54012678493.pdf
    • http://geniuschulatutor.com/userfiles/files/bijasoviwegoxopitap.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/60342534893.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a0b6c2bc---66322677166.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4998f2267d---mimerubezizuwizaw.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r6bglqa9p697a3v7j08a4kahmm/wakafofi.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf04a42e8---gafewubi.pdf
    • http://sam-global.info/files/file/5653082441.pdf
    • https://observatoire-omic.org/documents/file/61303362507.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/8242381546.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466df40c7b---zugikusevikenedus.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608570dfbfb3f---7737457798.pdf
    • https://pristineleather.com/userfiles/file/94176159537.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/34252776617.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bbf0a8d6ab1855f73ca1c3af00315463/17307356833.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=year+1+addition+and+subtraction+worksheets+pdf
    • 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_off0000c932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 16792 bytes
font_01_sfnt_off0000e144.bin
a7ba8d5b12341ca917e14ed705538a3b4ab05d31ca59f043f170d9663589ec5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16612 bytes
font_02_sfnt_off00010c74.bin
2413d0a1959ea6d18f78f51b21852396f70fd84886a4c8fc138e702baf3c7d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 11124 bytes