Malicious PDF — malware analysis report

Static analysis result for SHA-256 57adf30323da858b…

MALICIOUS

PDF

75.8 KB Created: 2021-06-27 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af0ab4d66ab789833476abcfbe3b51b5 SHA-1: d61a09b5b87f9333a8f02f479abada31d8bd7097 SHA-256: 57adf30323da858b7dabfff0d9018f68254c761949951be3a90c9f6d794b5c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=north+pines+middle+school
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kapagibasetesalelito.pdf
    • http://yuanyoujie.vip/userfiles/file/zibosasixati.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774dd36f3b1---xufumak.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14717459058.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed3d441c2---40233412368.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sr4qqd4joo6e5eojsvf1q7v676/86427191616.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/78g1vquqb3hsgg6sigtsc509q8/pozop.pdf
    • https://jotekonybakterium.hu/userfiles/files/lofene.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jgmsa6odsabtpt80l07iv9q4c6/34582751005.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/n8ho0ib6gv9gqefialpuq70k3u/nimogedireperuvefikijoz.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528054220.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00be2829e1---12963371881.pdf
    • https://brahmagnanam.org/fck_uploads/file/95464009206.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/79958979938.pdf
    • https://isosklo.cz./uploads/54299270913.pdf
    • http://videofilm-tv.ru/content/File/13327778533.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7edc97eee27da0c02fd338908149ba32/zedibimuvezigiwuduk.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b6d18e01c9d184f90134e130b0a63aaf/gijirod.pdf
    • http://castudio.eu/userfiles/files/42329038358.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e3823ca---zawamukasaniwudifowutu.pdf
    • https://akapacha.com/userfiles/file/mijozewerabobad.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ffcb5e60---bavajiduzubixadogiw.pdf
    • http://phuocthuan.vn/images/pic/file/75720826750.pdf
    • https://restavracia02.com/userfiles/file/gopaweboburapevo.pdf
    • 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_off0000c805.bin
a467669cdd211c382993f7b60ccdbed47960865eee8e18b2ce39aa0338221212
pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 10596 bytes
font_01_sfnt_off0000dffe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 16792 bytes
font_02_sfnt_off0000f810.bin
95bcc7866afe63cb97ee2c78aefcee519da64ec92147a36e6d6e2ff96eb55bff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16160 bytes