Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fe6499e5fe6641…

MALICIOUS

PDF

101.5 KB Created: 2021-07-05 05:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a055b8eab05247e6b1fd247354b8d97 SHA-1: bd831eedd13f523e4d19007bafe6850a091b9b65 SHA-256: c1fe6499e5fe66412d17cbc81bd4958dad48f794a249248da736895bfb528f71
176 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 potentially compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiodabo.eu/userfiles/files/92086978136.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/milunulipu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fa44f50f---vojonipokotiziwon.pdf
    • http://sobsai.com/ckfinder/userfiles/files/12923152803.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5b30796b4c5451c3671977f0ea2c52b8/kajiwejuk.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/07f061411a6aa26b43024922d0a42334/57348501915.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kuxor.pdf
    • https://kermoulin.com/userfiles/file/63469062594.pdf
    • http://hurtglass.pl/upload/file/lonotizaganonogu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd15f381c---fogofojisefodogo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609751678df4d---nejaj.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d0646f133ab---98918584402.pdf
    • http://157.230.241.115/image/upload/File/56606035718.pdf
    • https://marcuspietrek.de/MARCUS/files/file/kogiviwoxiluxumo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160befedd43a5f---23095113238.pdf
    • http://goref.ru/files/file/nepelopukikisujanurumus.pdf
    • http://salon-urody-bellis.pl/images/file/xexagadoked.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc344b2998---41203604981.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qiv60otoitd1aecari1tunb0j6/xagovi.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36ce0b8b3---siziz.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/delarasitefiju.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ke20pva478m5p0jogdgn6qjaa0/46042839891.pdf
    • http://candybeauty.vn/upload/files/dinaposemibuv.pdf
    • http://alpha-cp.com/userfiles/file/sifekazok.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bijuwawa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=howlite+turquoise+properties
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011364.bin
6da49ce3282d8c2a7ef82223987738a86e09d1cd72c886971207227fa075ffaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 10304 bytes
font_01_sfnt_off00012ac2.bin
cb80351be5c1ae1a33a1fdcbd92e94d991c5acedee5394b875f90f69bba1c127
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 17980 bytes
font_02_sfnt_off00015a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A61 16792 bytes
font_03_sfnt_off00017272.bin
319c1d6b5a9dfe45ef2c311a2d5ba00a192ff2e3c7a2103ac7a27dba584f9d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x17272 16144 bytes