Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1c170558bbf45e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 07:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfcb72bf62ca15890beb5c007725158b SHA-1: b9cf4ea980f8dc36e5db5841e6baecb1d4bb8afc SHA-256: fd1c170558bbf45e82dcfebecb2c58d169cecd10ba9103d04c04717553d3a288
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings suggest the PDF is designed to lure users into clicking links that lead to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://normel.org/files/upload/file/januzebitexe.pdf
    • https://titishop.co/upload/files/91320162386.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/birapepojufozunas.pdf
    • http://talesma.com/E/file/67085903108.pdf
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/73000619953.pdf
    • http://sieuthimaynhapkhau.com/upload/files/33285027865.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613210257a772---pumivakuziwibivuvaxota.pdf
    • http://schokoladenbrunnen.de/idata/taledavur.pdf
    • https://stratasphere.online/userfiles/file/veperuwamesulajutek.pdf
    • http://streathamtaxi.com/survey/userfiles/files/41733446048.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/43243692094.pdf
    • https://intrigantka.ru/images/userfiles/file/16790798008.pdf
    • http://goldstecq.com/userfiles/file/84091029991.pdf
    • http://leprofit.ee/cmsfile/contentfiles/rumululalaginotapisaserud.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98114335468.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/rumepov.pdf
    • http://seanmore.com/userData/board/file/mufulox.pdf
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b5519b470255755e4ceea43db4102954/rabogerulimuwumu.pdf
    • http://rzn-house.ru/upload/file/sofuxakejikaka.pdf
    • https://pensionradvanice.cz/res/file/rukituj.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/41722195555.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7r5h1h4aujldmf2m4a9ea5pc9c/10172947662.pdf
    • https://syteq-pro.com/userfiles/file/4923071191.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=zindagi+khak+na+thi+novel
    • 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_off0000c513.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 16792 bytes
font_01_sfnt_off0000dd25.bin
0870095a57735a473b57f0741d53bf06e6aaec18812c3b050edc6ebab6cf71ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 17860 bytes
font_02_sfnt_off00010b9b.bin
0fedb23a08c17066cc4be22b4b5dd1c16dc5c2b0b61998c6cd659dad1c4aec7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10380 bytes