Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a72a594807b87ff…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 244df24bd003f494c040eb3cf9f04c3b SHA-1: 45c7a134552870edb98d34994d1802421235a21a SHA-256: 1a72a594807b87ff071cf115cedced23625ba5cadf69bf70e3957aea27bec82f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The sample's structure and URL patterns are consistent with a phishing lure, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab9b62776---zugudoxodejewatixeturiru.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/257b39e1816884013db0323074f9a6dd/xewedawolaxuvogikukos.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086386ab6922---nixale.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/56803350262.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7b85e55e60f763ff3c59f9cb279a1d6b/notesik.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7418c3aaab---nagiporopiwidovekege.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/88031af823a9f38e69ba25a429528d2c/17656886401.pdf
    • http://slp70.com/clients/873855/File/falarikomofipewuzamitovoz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/26db0327fb043332f3e1ff9193e0ef14/46413295598.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/16493ffa940f01b6c4f99df806f384fd/savitedugib.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607544cb203aa---35515879625.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/804db8aabdac4630b254f23ae2d43478/logugeketikezaruxilamuka.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210610_BE4ECFF344AF4F15.pdf
    • http://sva-jeanroze.com/xmedia/file/soxupozu.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/46353453617.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d1046c689ec2f399114108afa88e7836/19031059405.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/b48343a92db3279783bec3e910baf8a0/10886094023.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073695560e58---wazudurux.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1nesqvhci6qdqnvhvm8o296om/86444342977.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f1244be9ccbf534010cb91a5ac69093d/kubawisetojarokesutebag.pdf
    • https://tavio.ru/files/file/waguderuxopil.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/09258300e9a399bae40dfaadfd687647/18810614076.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e25f3d598---mozuvumilidaleg.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a96cd194---wudibog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=osmosis+and+the+incredible+egg+lab+answers
    • 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_off0000d880.bin
a2102fbb22c6ddd721520f5f230e5f4d9039f2591358b4245bbd30f689904493
pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 11068 bytes
font_01_sfnt_off0000f1e1.bin
6376f984b7721a8c75fc8c5a3893e49eba4edc2ec053717323ea051bffa1b86e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 16992 bytes
font_02_sfnt_off00011e5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes