Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9238a5c7ee7f25…

MALICIOUS

PDF

93.5 KB Created: 2021-07-18 13:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1aa708c3ffb24b8610e751f6dd7d7b0 SHA-1: 614218f359698ff1c9ed4a15d26ff3251b969195 SHA-256: 7d9238a5c7ee7f25f038e79a340944df47a033aa99c3bba83ce3781aa45bb61b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or phish for information. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7dec41b6---50895470864.pdf
    • http://tcihk.com/userfiles/17296008485.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ggc6nf9q9u983o786jheudpu82/wojunosanerewafijepa.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pezux.pdf
    • https://al-farh-iq.com/upload/userfiles/file/98438446402.pdf
    • http://azizolace.cz/images/file/sebugejasavomagak.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b1285072444e430af5b7ccba08ce81a5/21057810408.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdf
    • http://turhantur.com/turhantur/files/95892488236.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607841b6ba3b3---bewotewagodefodokokaseve.pdf
    • http://tomaszfilipczak.pl/userfiles/file/66281675491.pdf
    • http://jjinline.org/file_upload/file/43422804978.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1217cb853---duzimuler.pdf
    • http://cachnhietcacham.vn/Images_upload/files/nizarekubolositezotiro.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609375141fdd9---36881897825.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/bigekoviwomujijinuwir.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fd94ed709ffa8dc4e42f61f1b50e6022/benipufupapiko.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eff45f8ef---bimesad.pdf
    • http://mutamobilya.com/images_upload/files/16451237595.pdf
    • http://aitrans.cn/UploadFile/file/F1202107080707264054.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948c0f30af1---28640187734.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s623346d5alb0ld8ks9a3rekha/papakerakivodezilelobamu.pdf
    • http://say-international.eu/userfiles/file/63780974224.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2f1259b1---52428397879.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/varutepekawu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stores+that+do+layaway+near+me
    • 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_off00010ac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
font_01_sfnt_off000122d7.bin
769b78eef3f16a97e9c45d89030d5f819e28212b92b39bf95495a88e1b097517
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 10696 bytes
font_02_sfnt_off00013b45.bin
0eb54882f51cc9fc37ec2f2cc2cafc88b008c9583eba11d28cba32220410ee16
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B45 16900 bytes