Malicious PDF — malware analysis report

Static analysis result for SHA-256 b491fcd2084e107a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 11:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e86f19fb53b7c40316310858ee7d994f SHA-1: ce5a3c820f4592d3c6f6ca3c4f2e71487de43e4c SHA-256: b491fcd2084e107ab6825265ef946a41b1f882f00323f56cf15182de63a36e69
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://atallmed.com/userfiles/files/4053117002.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d82bf179fcc416e4e55ab63b10e8011f/gaxepuwajesunarajagutomos.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6o2l7lnlvbvsugkg9dd265sgdg/mewuwikarinipo.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/69639290551.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099281af404b---97380771378.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/79511022701.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3916efa35---11338468075.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/widalosijodemenelinugeri.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/03edd73971d023106e190a256ab5b83d/powurawarologapuvuperoj.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d40d78950b---mokufepemager.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfd07ecab---86508267612.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160825219d1fba---64362108148.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ae90b41d928c69be374709909a0a940/36268544145.pdf
    • http://epmachine.ru/d/files/79202806536.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m414ue9l4rcbol0hk3ksemgmor/sifoxifu.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/stug06u88vf9sg3bnck95hg632/22370796957.pdf
    • http://analogsys.com/uploaded/file/579314733609f0f54445d9.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4f0644da9cc5832cf694f901c880766d/33497956285.pdf
    • http://prime-standard.com/piceditor/file/ninife.pdf
    • http://driver-jazda.pl/upload/file/9622427010.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae373bd3ab2---lefonasefisilifireviso.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/77236d4963b1b6a5d0c56f22ade75502/tuxidelibesadolobawani.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/248ab32ad7931d23b5943dd80ca760c6/44287678301.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/79ea93160737333a2a1487bd889dffcd/62478238064.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+add+jpg+in+pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/43628175012.pdf
    • 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_off0000e94e.bin
91846fd0fc727f279d344eebe3dca72a45d255e79c5b53f88d50b53ae33ebbf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16908 bytes
font_01_sfnt_off0001157d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 16792 bytes
font_02_sfnt_off00012d94.bin
a4693df8419952d0ca6116c9c6403f9eab5e3b812a0f0510fcf76279250ce944
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 10436 bytes