Malicious PDF — malware analysis report

Static analysis result for SHA-256 199f5b4140a0b608…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 00:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c020750cc05b110db4fbb4135a98f002 SHA-1: c14ca8a24f57e34880b1dd40d5ac49d54344b10e SHA-256: 199f5b4140a0b6084f930c39bd9e9db1f79c9b6f0d828b7939e6cab0cfc93b99
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data, indicating the malicious functionality is likely embedded within the PDF structure itself or relies on the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610c363541bba---79225926311.pdf In PDF document text
    • http://babyindex.nl/images/uploads/fuvozozozufakipuxal.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/ruledunemumejomaregifigik.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2827d56d59889a419fed6bcc1eb5df38/74129494536.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/33513923483.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/zigegumejuxomeme.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71bac7d076d561f22311bf69be74d4d3/51537496877.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cc2d3b60---simoluwuriwomunajeme.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6cspg3vjsfb4qab7pmntj47vn5/jutokunaginonajot.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kubedezewejod.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bdf267b---tuvub.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/79429465803.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/77113798500.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/54302613722.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/55192735822.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/8557361342.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0816cffa8a978d4bced72d2ebfb0fb0/muzemobalexudixiwe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5a8821a0---57030250470.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a48512ddb---17473870016.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/73425201693.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a42922f9f---72851748294.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/divutimefonami.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361a153043---23717364209.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/53167187503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=problem+statement+for+qualitative+researchPDF 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_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 11056 bytes
SHA-256: e0aa684d28ac74b6462040045cd6f4de03bee0614ac12d5947c5320aeea16513
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16824 bytes
SHA-256: 4d5b9e36941fc1a3dc2687332570f72207f362f72fe907f65e4a0635def04c6e
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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