Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8691ba4e059717…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 18:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f93065a9eba511e283e3e3e73a5b45ea SHA-1: 6799a1f15ca2f8cfabc7123a24615bb50afee957 SHA-256: fc8691ba4e0597177088c19a136adbeb1e819e427343476a73ab03df569fa416
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to various websites, including compromised WordPress installations. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d772a9a0c---jelageteki.pdf
    • http://boathousebrokerage.com/userfiles/file/65632104808.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4000a4b4a6850a245f7e04814e082a6a/suwovizudagimararor.pdf
    • http://magendans.com/imagefiles/file/juweborodutalikazenotab.pdf
    • http://dragonera.cn/admin/userfiles/file/32768644291.pdf
    • http://supermarketdv.ru/files/file/dulenegimowoxoluriludu.pdf
    • http://www.srijonihealinghome.com/fckimages/file/lazuwapanodilevunemo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/6851fqsuopjrkesnn89dm5gvpb/9081605185.pdf
    • http://ahcxdq.com/uploads/file/282357199847.pdf
    • http://smflow.in/admin/uploads/file/64507827768.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/pmbhndkdhmq4rq9l424p7rbrqc/35209286974.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/39eb23f2163e3c40e331fc820f01b292/13473721250.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa48836f6---xuselebiliduwig.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e01bec85---352461161.pdf
    • http://eko-inwest.eu/upload/file/18341423066.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8923a511---399379968.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/nolufizagogiruwe.pdf
    • https://lionkingbali.com/uploads/file/tanufosejeweme.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210620194136.pdf
    • http://sushiloverca.com/uploads/files/14498421070.pdf
    • http://pytextiles.com/userfiles/file/xanokolo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79ca77472e7c07844202764d246df4c4/latajovax.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad36cac638---rafilekivatageruworow.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607182a8bccf0---77270923103.pdf
    • http://altelaw.com/uploads/image/file/76861105629.pdf
    • http://gerocuki.hu/user/file/82177396025.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=who+is+my+greek+god+parent
    • 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_off0000f3a1.bin
47fd4ca1ea148129454345865ded07df3a59d01dfe153c10d37eb67174279026
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17092 bytes
font_01_sfnt_off0001200e.bin
cf15485e29560dd6b943b89606fe74fa075c16e3fbf3ab3a073bf698e6730d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 10992 bytes
font_02_sfnt_off0001394a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 16792 bytes