Malicious PDF — malware analysis report

Static analysis result for SHA-256 a605b2f7e5385d73…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 08:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c4c7adcefee10cb7dd6b9cc0bca90b8 SHA-1: 801068a7b6059e41ad2092c6ec82520857f19cdb SHA-256: a605b2f7e5385d73079c80b1bae6bd270ed1a5e9b00cbbdabb73cc2035db7978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c353d7267528ee713b41471a799e63b7/rutuli.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160839f898cf12---zemuzaxunefeletadazikavus.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/99357703584.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0424489635---47051079346.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/punadax.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/veviluwo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2031a6b2dd680b0b13600b084d18095b/93378837025.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/12953771554.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/2576130724.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/76267557500.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bujuvosavu.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/tematodesifijar.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladeb.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/46864004345.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf111bae3---81979460938.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8d52a8e51e151af1198f276cc2b4783/58991507358.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93b423fae---28308388426.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7a4eb530e81d9b252d630a69f8c06b94/16051043615.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e396e1eaf---gijixi.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/94177634202.pdfIn PDF document text
    • http://schturman.ru/files/files/1271528790.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/19998675553.pdfIn PDF document text
    • http://kgmda.com/upload/files/19031760885.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076184395855---rujisawamogesafuz.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/mubuguteguzegejukedinote.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/16428971382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=play+minecraft+creative+mode+free+onlinePDF 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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 16892 bytes
SHA-256: 4d22836374e2c5fe23da6777abeb1dc2ce77f8a222fe554a18bacf1c91347679
font_01_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 10648 bytes
SHA-256: ea1a5741643382524cf233a3af163fc896946b29e6333f514df459fc778090eb

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