Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72f1e85c5a54ac5…

MALICIOUS

PDF

105.7 KB Created: 2021-06-30 04:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d496ef7145bd0a3c2c89a277f80e41 SHA-1: 151e998f817e7472237cd80d507651030a3ed207 SHA-256: c72f1e85c5a54ac5ea910c2c47ad517771a3f1ba07fd408e58bc8db2c6e2d69f
156 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 the document contains link farms hosted on compromised WordPress sites, directing users to potentially malicious URLs. No scripts were extracted, but the presence of multiple compromised domains suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee364aecac---72055155697.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/g93lg9giglv3rr29mrvkm31rmf/dadutozajuzepege.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f5irrnegqj3vh5agdjk6hlugo4/36267523888.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ig5iohgnu4tc01lk6a59q6e9q1/65850445510.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i0cc6iite7lc1bqn7dbcs80i52/32976260317.pdf
    • http://teckim.it/themes/userfiles//files/jegasiwe.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4c9a3d406933b4c77e9b115c5e6bc380/72845112472.pdf
    • http://sl-light.ru/design/img/upload/file/14329859171.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/36880948f96a270411e5f51dc2ddc0fe/xodusexapubo.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab102c174ad---wifulabuxefubizani.pdf
    • https://alperbehang.nl/userfiles/file/jekis.pdf
    • http://superplasticizer.cn/d/files/vinerewojari.pdf
    • https://angkorphotographyguide.com/userfiles/file/pulabawasavaxojefokosoti.pdf
    • http://bigandtallking.com/userfiles/file/xomizemozawagutanil.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091473cb5b64---fojuxotuweso.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u418l623t5lo32184uof6svln0/50401561232.pdf
    • https://5a.ro/ckfinder/userfiles/files/72177886743.pdf
    • https://alzubidi.com/userfiles/files/goxeva.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0537da6412---95238834407.pdf
    • http://princeverma.in/uploads/files/15415366227.pdf
    • https://lncl.org/ckfinder/userfiles/files/mirutobosi.pdf
    • http://headrepublic.pl/images/files/12574020099.pdf
    • http://twxcd.com/img-aim/files/49188326232.pdf
    • http://ahsaipu.com/v15/Upload/file/20215121019516875.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09b86406f---29233483711.pdf
    • http://imaginove.eu/data/Files/13379369458.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=to+ascend+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015f43.bin
c62346804095e039d1d905c25bdba23ff4acf3fc1f9bfc9dbd2e40e1a2672235
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15F43 19592 bytes
font_00_sfnt_off0000f504.bin
57d8087e2060a152e5ee3c9187417d048e7a85134e94f03d3acf4969bb7f2f04
pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 28388 bytes
font_01_sfnt_off0001397b.bin
e2d6618ff6f9d7ffa137106cf30e5983fd46cb89c0a676693c2fe6677a6c810c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 3536 bytes
font_02_sfnt_off00014732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 16792 bytes
font_04_sfnt_off00018140.bin
5487c156cb7007d45180151e316c3e31e689ae8ec9858e777a5dc520bd6e8862
pdf-font-stream PDF embedded font (sfnt) at offset 0x18140 10432 bytes