Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc8bbab971a5aa…

MALICIOUS

PDF

85.8 KB Created: 2021-07-26 09:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 204a18f54b11800f5711f5284f9a7410 SHA-1: 35c80f7552c0089c5d142f1324a432f0fb5da282 SHA-256: f8bc8bbab971a5aafa462d26a5769b13c5456ca6a40bfc00373b34aa313ca5ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links and the nature of the hosting suggest a link farm designed to distribute malicious content or phish users, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/11uhffrvguc0tveq0ed95261t9/xifuzefuguzixi.pdf In PDF document text
    • http://cybernet.asia/UserFiles/File/90802015599.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e8d7j62kp9j7rqnh1mrg7kqrri/25295353742.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fdjhu54fpqpntc5b05s9295qab/45415359729.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/fabuleduzamuw.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tbbhm74hu4tsir7e062b47i2ap/moluk.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c981c37f14b---47527642306.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mr3p99jvp9rqvk08j1p9ifibdf/26765390904.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021053116481878.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/amo3o0kk1hnns9tbmpe0863fo0/19944772306.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0c96bf4c67d96b9e268babb2381e44dd/89932732275.pdfIn PDF document text
    • https://aspirans.com/files/file/72670225326.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449a2ddda---jejosirilof.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/30224523157.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/94898f1c39f28b17dfd7c586f2903f85/40634070558.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0720e2bb2cc3bff24e87dbc00a76551d/pogezudis.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/83634e99052efb55ed3e30fc92548aea/bumadek.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a250becbf---72563201208.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/54246527699.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kovo3av2e79ajsirbfa2sncrg5/vikenivugabejegojuwez.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/st435fvga8oo2apvbg5l9mq9bg/sizibojugip.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/us177eic0p84q3mqavv7hk0r84/povonim.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab923f42283---dezux.pdfIn PDF document text
    • http://zatacorp.com/upload/files/vetizuvifum.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/litedumuk.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lipifewimokodazogog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sample+letter+of+explanation+for+criminal+charges+to+board+of+nursingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 11484 bytes
SHA-256: ff3164822ed47f40284a8bcfbf9559ed043cb472f3b7ab52d73f4a9ed637db17
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 17244 bytes
SHA-256: 7769c2029dd520d311394c5da382dcef83e33d566ad6fa48da930da88607c44e
font_02_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1