Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb52806062a0c04…

MALICIOUS

PDF

83.8 KB Created: 2021-07-27 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b087ee319f238d141d4927fe9c30c897 SHA-1: cf2c8d79298a73e8e46ceecf07f1747781d02164 SHA-256: 5cb52806062a0c04ec119c28e4eae3209482db46acf57059fdce78392abf9954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1788318b3---jinilumar.pdf
    • http://eotp.info/sites/default/files/fck/file/xakomoniniforolaxazekebul.pdf
    • http://szpitalstrzelin.pl/userfiles/files/malizuzit.pdf
    • http://curry-box-deluxe.de/userfiles/file/23326084437.pdf
    • https://ajitcoatings.com/uploads/95238661572.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/magud.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/0o902sbscbkhsn9k97a142r2h4/fazuwesekelumeze.pdf
    • https://amrapalispot.com/userfiles/file/dolorolusatetesofuxawa.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d97c49b7e---rapuwuduwajagok.pdf
    • https://vargyasnekonyveles.hu/kepek/other/file/79649853548.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/64449281269.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/87508637374.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vstolteqgd1nd6rm156coj09j5/mekasowaguvuzatuxosodis.pdf
    • http://foto-video.ch/userfiles/files/8102222351.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b50de317c4bfb15ec994848364754e70/4714952338.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c5b0eb0bba03a371cfdbbb3c6d19d821/xoxoruveropo.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9fc9afbda8863d64818dc002e10e3a84/12064547881.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93ef42aaa---4076211951.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c4425d05---vilogulezazikazudijotux.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6a8ccbf4---sadew.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890f840f61---velizunuxarezeguxidew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unit+atomic+structure+ions+worksheet+3+answer+key
    • 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_off0000e23e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 16792 bytes
font_01_sfnt_off0000fa55.bin
de8adc56edd638799af03452af6e6fc3bae62a47a2366c31cadc3ebcae99c6d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 11020 bytes
font_02_sfnt_off000113ef.bin
a8bb5aafd975f0a4a5412e84407a9795d25a73e7b40260c9acd9a8d2cff512f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 17460 bytes