Malicious PDF — malware analysis report

Static analysis result for SHA-256 68268dc165f58f5a…

MALICIOUS

PDF

111.9 KB Created: 2021-08-02 12:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9084f2efc8a2c319d0e5642edd1dc394 SHA-1: 5733afb7c9272ce55fda9767b3378c70111cc86d SHA-256: 68268dc165f58f5a8c11cff86f7abbc27882e67436a489281f350c2bd6a37b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc9cf32e3---rajurinesixotivobewaxulu.pdf
    • https://grancom.by/upload/docs/116127637.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/93gqfbl6lg1ctnr2ec1jmugdbg/55861286603.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/21663dc5f6fa9ebdf4761c2e74e9ae68/24258970956.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7cbd92e02---bofeluzorebukuv.pdf
    • http://asbazainville.org/userfiles/file/leruvexifamirupiwulali.pdf
    • http://aven.su/userfiles/file/6189388548.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/5be74as07ut8o3pbl5thsa2mn6/nuleditasalasezanawivubu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/98fb108b367630efae79adff9363ca75/matijevofijoxejokuz.pdf
    • https://an-professional.ru/img/files/file/28228819628.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tj7l030itmhghmb0k40saf17f1/15853793085.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51fcc8595---nipesejajimi.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607e743226f4b---wosir.pdf
    • https://bacninhonline.com/webroot/img/files/lulisexexaxefusifotil.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051612542673499.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d3737381---bimawobadasikowotojimur.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943b49e228c---javasimapakivaperal.pdf
    • http://nuraski.pl/wsg/userfiles/xawifisisuwinebukunej.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/62866611113.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rt34o0hm18cffhrnlalvmeu9jg/85721779491.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pdoo8i2lkn2opcvoo26aq8bsnf/8677634510.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53e47d836---bujajo.pdf
    • http://dailymaydemtien.com/userfiles/files/45619218566.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21fca6c1ca0120297f4b8bf5566371a8/31430162101.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8e4ae23bf5901e0257d72b7f654171e8/21974677121.pdf
    • https://getadoc.in/ckfinder/userfiles/files/bojorevezenidilidaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=don+quijote+de+la+mancha+version+escolar
    • 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_off00014f62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F62 16792 bytes
font_01_sfnt_off00016774.bin
664cb09aa81e2a8410dd2f9616949309971e1929b12e2c06b3e5c53bcf351cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x16774 18044 bytes
font_02_sfnt_off0001954b.bin
6f9cca90661a12c1596ef8b5964b9f78d134f69b1c89f1848bf27ef29bf17710
pdf-font-stream PDF embedded font (sfnt) at offset 0x1954B 11080 bytes