Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb2166347485db0…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 10:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa07a53a1b83e0c73ad7458bc43a604 SHA-1: d0f2721988652046485b3abfd91d2276c009e9bd SHA-256: ecb2166347485db0fa85988eebb21ccf9c81343ff65d99b51c75661467bc1d4a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://diamond6ranch.com/userfiles/file/tejawaxil.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/649e14cb79aa690ed5844bd232568bbd/63249521593.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sadebugezulolujopudiwu.pdf
    • http://al-bandak.com/userfiles/file/72629846275.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6541a59d---vokapupavamopo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799ca4b52b6---wumilapaxupe.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d67cb166e1a---43322426842.pdf
    • http://dimexautomarket.sk/ckfinder/userfiles/files/xutetedisinalerewifuja.pdf
    • https://ost-fogging.com/upload/files/manunezotujipopulemidob.pdf
    • http://suamayin.biz/userfiles/file/42933708414.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b1fe326a75ad143cbead1921bd2003ff/85013307637.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20353d3cf3---48170597650.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4k6iphfe700bssi34bsdeks10/rajaxomisumufamusiwozur.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0357538b2ceb7ebc91dcec5b8d02dcf4/11084160453.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3a24fc30---16792434632.pdf
    • https://ubranni.com/uploader/files/poduw.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/luf59va4afa79ms0raap61nkv0/49599967780.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242abb141---81362460530.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/32665221728.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ffe1eb0a372414c3f153b23270e8697a/dozateponigulutoweraliwo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b20e9dd1---98230746761.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078439e2c3fc---fanog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=count+pages+in+pdf+without+opening
    • 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_off0000e965.bin
9f21c28eb152c9cb78f3aa486b12c961349e6b15dcd2f2ca39f23f58bd971694
pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16816 bytes
font_01_sfnt_off0001153c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
font_02_sfnt_off00012d53.bin
6034d586074edd01a85ac5e0b0176cdab9326ae71b9e26dc2387c9bc5890713b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10848 bytes