Malicious PDF — malware analysis report

Static analysis result for SHA-256 081049c63dab25cb…

MALICIOUS

PDF

101.7 KB Created: 2021-09-07 11:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c64e19c68301184db344d8ec2241f6af SHA-1: 19d4ce93996b5c99f013f3088d5f0fe8f6a046d2 SHA-256: 081049c63dab25cbb4190fc6e9ee894e660cd3cb8e9ad0a8275ec8df0edd0a16
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vmwarts.com/ecovic/file/ditavoronuxipedakirimo.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j005b0aessgapos33agh6vg9e4/68926514779.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/nafapedimitetadolire.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80a78147a---namowigidezeg.pdfIn PDF document text
    • http://ridendo.cz/files/file/femonasesox.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/tirususanut.pdfIn PDF document text
    • http://timebymtm.com/upload/files/tijebagujaruxovu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/99765553157.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/27b00ae00a0a65b1a6512a2881fde93b/70555963259.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/guxikufufazubugoto.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/navowewejodatoro.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/vufizikepanonu.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/gapijorizukezowari.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c151f77a585---54920142063.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098646ebab57---zojegimizuzaperufefedo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4c8113f2---84101491348.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/culvn107l2c1vp3ea9m5niolsf/kejeludevim.pdfIn PDF document text
    • http://iviltra.lt/images/files/xobimuluzubovibaker.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zipape.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/59649126347.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c04577ccb---75232957862.pdfPDF link annotation
    • http://erpsamik.com/ckfinder/userfiles/files/gusupibi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16093a787cee0a---kenovibijetar.pdfIn PDF document text
    • http://24cvety.ru/upload/files/60367764708.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/bevekalifet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vowels+examples+pdfPDF 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_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 22672 bytes
SHA-256: ded19d5d4fb3c9e2644540c9eca1df3df7314f1b85c1785a8c63c5dc30a35992
font_01_sfnt_off00015945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715C 10424 bytes
SHA-256: fb6ebacb76abf361610ca05ecf797f320cb09a6eacc47410cdc917696b89e71c