Malicious PDF — malware analysis report

Static analysis result for SHA-256 073891bc8c772b8e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 07:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b305000dcc614e26d561888e724cf788 SHA-1: a80247b588287e31b3718df61082951b01df6577 SHA-256: 073891bc8c772b8edc46260213cc2bdfafab8d3b5e7acd18f139a7c7f64b21e9
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161392eb0bfe75---72084945766.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161420f08c5e12---baloxawalideji.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/99428893371.pdfIn PDF document text
    • https://777mto.com/contents/files/newavilojekub.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/rowugodoj.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091014501861.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/maduri.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/58f98393aa4d6e9bfcc7b4ea5475104f/vulezunegobemoti.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/24434022062.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/54605253150.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vozujivirebixesovetewow.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44822139559.pdfIn PDF document text
    • https://tomas-music.com/contents/files/10901611572.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tevunosobegufiti.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/bapenipidinaxozavevitegof.pdfIn PDF document text
    • http://www.toptehnik.si/images/fitopazowifi.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/sunuvu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/16653460004.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ng6kf51tlqq381sgelsmseggel/pomimifapevobolojen.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • https://educhina.mn/editor/files/lotijeb.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/sovefugegidofigunajojepo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/93572382151.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/18232897345.pdfIn PDF document text
    • https://ip-pharma.net/data/files/27023804424.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/71862848919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=neo+monsters+mod+apk+unlimited+everythingPDF 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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 18128 bytes
SHA-256: 6a4a1e60faed12a526a283c82dc74951a0debb888021271528c570351b42bb2c
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 11188 bytes
SHA-256: 2c3ee01a51910c42ddd8b4094fcd93d06f457661e54bd6b762f9b1d9b38332ce
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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