Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bbea71b74feb9c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f320e12879e5abecbdea72adab3f673b SHA-1: 52fcc19cf7b7355e91290a936a390486b6ab35d2 SHA-256: 57bbea71b74feb9c942d304272b8d373c84a2aee04624dff469f8ced3e297a93
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links indicates a likely phishing or redirection attack, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/fefusepasogebodilima.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/bexofosod.pdf
    • http://phunphu.com/userfiles/file/11064295912.pdf
    • https://bold-iot.com/uploads/files/202109070202093691.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/jafibukotuzizegigaxulemo.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6664027b0018eeece16c151a7a6c7f91/nejesizozasexedizag.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/katadosuwuwuwujexipalu.pdf
    • http://lovesenergy.com/file/xilotezasawukafazofoz.pdf
    • https://mimzyonline.com/userfiles/file/17687944546.pdf
    • http://rockefellersgold.hu/editor_up/zaxumedojarijaf.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613882ef8dcee---45556307982.pdf
    • https://cobrawire.com/userfiles/files/dibakowuge.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/sizarabenelezixuwerunozuj.pdf
    • http://safarekhoob.ir/basefile/safarekhoobir/files/69319285835.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3acb504b---gasalumilokanevuvawomusib.pdf
    • http://jawarakreasi.com/file/64271706941.pdf
    • http://akcjonariusz.com/UserFiles/file/19623280460.pdf
    • http://deleersnijder-bocaege.be/images/file/76686972246.pdf
    • http://galettedesrois.hu/userfiles/file/sobesidek.pdf
    • http://hzjksj.com/images/upload/File/94706996517.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613964ec6c57c---mifeletifosig.pdf
    • http://alphamarino.kz/images/news/file/33006432143.pdf
    • http://www.chubsorn.com/file/files/89343524232.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/90724824530.pdf
    • https://curewelldiabetes.com/userfiles/file/bonipisamudofo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=beginners+guide+to+developing+android+apps
    • 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_off0000ebcd.bin
41cba052b830937dc18a57902267bb78e77cabbd8dd7c285c92753e2df3f34da
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10784 bytes
font_01_sfnt_off0001049b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 16792 bytes
font_02_sfnt_off00011cad.bin
47c81011625da885ef2f6e697d13d939408f635d5ef0b9320a528311e35e3be6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 18884 bytes