Malicious PDF — malware analysis report

Static analysis result for SHA-256 f905e14bb6316fdd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 22:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b027ef07f91a6691f3cbc5e89ec197f5 SHA-1: ecdf5aa0dc2c2037832db157b3b65dcda01e3416 SHA-256: f905e14bb6316fdd9eafada34c64452b9c1781346ba9717e31a1103896994b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified 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 external websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xn--2vxr09c6mc.tw/CKEdit/upload/files/zapekakakimavisizivik.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2b49dfe7---jomumivosufatalakokugo.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d07dda072af---vemivedexakeboxopu.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/34089747829.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eqd9lo7hb2b2cgnrtkmbl6a79h/lilevadudosimi.pdf
    • http://mylodge-naoshima.com/baxatibabiwi.pdf
    • http://runo34.ru/attachments/file/widuxu.pdf
    • http://parkety-patemal.sk/files/file/20279154427.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/jevuwov.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1edb3df4d---88988652414.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/81003798575.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-21/20210621190428150997.pdf
    • http://jyjwqj.com/uploadfile/file///2021070211034847.pdf
    • https://tedvandergulik.nl/userimages/file/17680160817.pdf
    • http://lixupeng.com/uploads/files/65817828873.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870ae661fc6---pokokuvex.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5377cc18---67915802763.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00227cdebf---80835794729.pdf
    • http://medicamarsala.it/userfiles/files/keredetadowutulov.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c064136c2bb135404eba42a8cf242406/27737970311.pdf
    • http://fasaac.org/temp//files/19671376460.pdf
    • http://archinfo.ru/uploads/file/vuzan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+images+of+architects+valerio+olgiati+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_off0000c727.bin
715f819223dcfc6a0a26e765c67281cb3f78de3c2f3772fad0403348ac56ccf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 10992 bytes
font_01_sfnt_off0000e089.bin
d2070fa3320f91aefb31b95ef74ed847c6e71dbb387c26f43ba80116684ebc19
pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 17832 bytes
font_02_sfnt_off00010eb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 16792 bytes