Malicious PDF — malware analysis report

Static analysis result for SHA-256 013450ee1f943617…

MALICIOUS

PDF

79.8 KB Created: 2021-07-07 15:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27cd104cd0a27207b56484b30476c07a SHA-1: 5b25f1a310bceae0166c2f585b9c4437e51adb2a SHA-256: 013450ee1f9436176c6ca869508dd556f5c2f4334fa91220ebaa1d807bfaf8a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly identify its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/88i4akaa15vquqb6smbo17tta5/98938579055.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ae7de8cf93b1b8bb30c7f31b1cd8053e/40362865048.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d1cea0894---semubunuwobesexolowe.pdf
    • http://fogathajtohirek.hu/fckfiles/file/gonolapawivalipunu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd00d7dcc51---6613675687.pdf
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdf
    • https://actor-conseil.com/files/file/69390152620.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b4e67b369---tuturisi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160724b1640998---dokeluvekaba.pdf
    • http://detaycopymatbaa.com/userfiles/file/42748155854.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/45066306596.pdf
    • https://bauarch.bg/files/64496669352.pdf
    • http://sanarina.de/ckfinder/userfiles/files/xobolirokamile.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/99887e9273ae2946703cb134bcd8325a/60838526525.pdf
    • https://poolpoint.be/uploads/file/difid.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3920a780---19944949614.pdf
    • http://nesthomes.in/userfiles/file/vopajamufejisarar.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qh3ua6rk24j3v3k1icjrbfl9qs/32523673446.pdf
    • https://arvikabc.com/images/uploadedimages/file/simekifeka.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/68fce8c2139e68a7b2705700f3c07bec/10685907578.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d245aabf2fd---42571933842.pdf
    • http://darec.sk/files/files/bozufewilawibemaviwakuju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=last+meaning+in+bengali
    • 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_off0000d40b.bin
d6f76b713f676bb4c4daf7a681ad8cb17beb4c2f5f51f82c85ce86b4a3297a58
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 17424 bytes
font_01_sfnt_off00010174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
font_02_sfnt_off0001198b.bin
7449f7b68e437b83ab9836f679651a5664133e438dbff786aa215dedc4a81abe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 10328 bytes