Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a076b50b1b7ec54…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 14:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0bc845791df1afa64e6ea41b53749af9 SHA-1: 07d1119749f28d70b30a3e0456a939c5bb5694b9 SHA-256: 2a076b50b1b7ec5471e236a45c2877535bef4b0b6200b2c243ffcaaa7e81e106
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting and potentially compromised CMS uploads, likely to distribute further payloads or phish for information. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ondebiz.com/userfiles/file/86763843270.pdf In PDF document text
    • https://zahidnawaz.com/UploadedImages/image/ripixuwokixasemepidamo.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/fenetegivimevisenak.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33801220147.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xesolidulefokexes.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/48e0b5af05b220d9585ebb9047915fad/28209239457.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/62334208684.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/nuvewedomewifevol.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_DDF3D1994CB7492D.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7c753616---dedegiv.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4c94168---pinurifix.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wajafod.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/rutav.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kewagilirawejod.pdfIn PDF document text
    • https://norservis.cz/files/files/lomamujexa.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31671210884.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/8185195675.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/87981330879.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92456642710.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/tefoginepam.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/24864276152.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/genenojemiwapof.pdfIn PDF document text
    • http://fxlcd.com/upload/file/43647532654.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3a4affh2hnhlu1bjmgn4otect5/4838525568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=crack+premiere+pro+cs6PDF 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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 10580 bytes
SHA-256: 2b4fe274e98b0c1b16551ae2c1a3056c91901029a3db02b8f25799a564e1977d
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 18488 bytes
SHA-256: 77df485ef9a9b9d0a69a10ef95a6635e24a85c174c89d327bd3bb4027e9ee77f