Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9387ca484d635f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-05 23:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c134eb4108b0d36a81c04a9a4f3703c9 SHA-1: 25438ef47999376c8df1addeabe238d7c1e53d8d SHA-256: 7c9387ca484d635f390665590238359d3d731d72c96d928b4b5f8919813d6869
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on potentially compromised CMS upload storage. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://basyapiemlak.com/yukleme_klasoru/userfiles/file/68279720928.pdf In PDF document text
    • https://motelandratecuci.ro/userfiles/file/11878022837.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/601f1e31feaa1c5c695e46deea06666d/25223189279.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/85681863199.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/450926e677062f5efec5c90a6249a540/pevadejanovusosevaxat.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///63225075132.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/sizuruxunaduvufuvuv.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eo7je3km3ok81sn4gsj5p24lbc/2213140438.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/81212707596.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/uf8b1b4n0vkmfksogkt1756fj3/40516728286.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/muwifav.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/puliruwigixum.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70ba92df72aa50e644274fa18e45c929/61186490824.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vkt3fn6cdqv7r2t5dasplak9h3/69442318049.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/bemonesinipe.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/tuwiromugukazixe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e18d0687c98e6c7e67b3e7d5c9653b54/35912308414.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/87344273097.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/93941681929.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ij9ukpq15v4k22i741s43q8ls0/86061949695.pdfIn PDF document text
    • http://markone-tools.com/upload/files/90714876086.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5dc92c9a027add1e28e3d8718cee1565/fasipixuto.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/niwipigowo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/eccb7be1f1bc092420af5df2a75ba762/59050970918.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/32778627473.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/86236260455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=do+i+deadhead+rhododendronsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 17196 bytes
SHA-256: 51dd31b932ef8b6754ace5a8da471b61d5d5b044de52ba013ace1f0ca390a72b
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 10204 bytes
SHA-256: b241537ac295296cd8478f5163d960283089911d70091f80cc4e301592c3cdab