Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c491f769ed77f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 11:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97c06298f77b6254f20bbb1ba7d53526 SHA-1: be28a46039191f7b43254d60085c525dd881dd79 SHA-256: 705c491f769ed77f24367dee5919ee32e4014ed78815f7fe76b7f323990b0663
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and heuristics indicate it is a link farm pointing to compromised CMS uploads and potentially disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, aiming to trick the user into calling a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160893bcdd0492---80288022221.pdf In PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/4627174304.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051608003573499.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3c5e7f9426824f9ad37a284bb90d6f0b/movilid.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/fidimexofedutavusemi.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/15804981829.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118adc663427---gidusoremuzizeguf.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dagowegomiwagem.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/47133295052.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fd2a2062dd420c07c613f89cffd72eb7/bemopavedisuwe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4c6e31ff7b35e1fc657f70b0f85acc34/42309234249.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/17938358520.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/retogigotime.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pamidotirumat.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/bawutud.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/19827111717.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pajumusutedusutafoji.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/gaxipepaxuwafarazix.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/sozafopafifirazu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/89385750720.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/80108108698.pdfIn PDF document text
    • https://uangraja.com/contents//files/wifegagagepomubidosafuwej.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/zokedomuxazinizaregaxula.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/mojopokutivisan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=physics+investigatory+project+on+cyclotron+pdfPDF 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 11208 bytes
SHA-256: bab84af62f6f73a56d6b7379fde3053951a864d7b9bbbc0b95346b746392fad6
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 17640 bytes
SHA-256: f990644200d136044f14e470d56fb20ff4bcebb408cd9b862eaf7bbb3ecc32e6

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