Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c82911b662b9b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 06:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72f4e260ce6ac45441e947bf9659ac49 SHA-1: 44d403cf8d13b10b39606e77e27e2a44c3825335 SHA-256: 9a9c82911b662b9bb0d1e59b5912cb22a1e2f6e650e43ea54a7310d2903272f5
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to download further content from compromised or disposable hosting. The presence of a 'download button' lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://mimpishio.com/contents/files/kudegesovaxutufebusova.pdf In PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/tuvafavebavan.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/12036499007.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134db179f8e4---55016400294.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/nulopa.pdfIn PDF document text
    • http://kunbot.com/upload/files/kajopomevaj.pdfIn PDF document text
    • https://sapporopools.com/contents/files/82921120673.pdfIn PDF document text
    • https://wsbtitan.com/images/file/73249535963.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dafaxar.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/69849944626.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/60377163669.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/zemagidojovazikus.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/83938696425.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/borugefabimepusufil.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/65aeabcd215154e03ef439dc1fc77561/xedevawuveburavoj.pdfIn PDF document text
    • http://hasyo.net/files/file/69882840598.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/92706991385.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/45991709030.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/vakejewubim.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/sevekagime.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84ec428e---97258529223.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/98435638973.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/53910298479.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/bupodaxonagezikebozemik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=warship+battle+mod+apk+unlimited+goldPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 18152 bytes
SHA-256: e7cb7358b60158c0756be957e18f4020991f2f16302be49eb20d82cfe620fcf2
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 11164 bytes
SHA-256: 83a831e40391afc335d9732defe3f6ba9e836bdd10a23369a4bd5b15fbac8977

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