Malicious PDF — malware analysis report

Static analysis result for SHA-256 161640b09f020746…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0961a42459e5fecc3ccc1858f047fe9 SHA-1: f79fe6c70e37158c43560f21acf6d79791414fa2 SHA-256: 161640b09f020746029f71b092594d127f10ffa7a91fea76982fd7c3fdc72be7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of 'utm_term=product+instruction+manual' in one URL indicate an attempt to lure users with seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffb5d306e---21875086879.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5e3792308e5c6afa2d5ca687cda382a/15899960115.pdf
    • http://clarksville.net/wysiwygfiles/file/62659000482.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6ca3f0b8---wodez.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160946d1dc1a0a---derajojo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94e765f0b---gaxegadow.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2415ce22a---zepebavavipen.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9277abf99e9fec4896db548d369cfc3c/60809064228.pdf
    • http://jonkmp.nl/img/cms/file/noralimudak.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/76610287445.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89f20ef53---totux.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/h1jj5d29u1sifkreeao0rohqe5/sodaro.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f59505b9ec38603298359525fe6d51f/merazasugafeguwoxeju.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c91089bba---52978482431.pdf
    • http://amandamaitland.com/images/file/97376776368.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453a3aa35f---92115581674.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5f7a3a30---dejemofujosigivaxi.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982a861e4b8---zelemaluvodopuroretikeza.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/frkm7e44f9ijo49cnv7kkdeg7q/56532162545.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/45600335e1d19c666781a1b1ef97809e/pewekarefojiluf.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2b17e5df0496d5c5da78dd3310efe070/sejud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=product+instruction+manual
    • 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_off0000dc0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
font_01_sfnt_off0000f41e.bin
c285364fc8cadbe2d96953baae0980e1237b372d6bb3b2b6eef3b34ddbbeb13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17172 bytes
font_02_sfnt_off00012147.bin
a14829f313b07cfc9152499f1803da1e7e2ef87b7627634a056f01be6b263a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10500 bytes

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