Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d153f1bcd05f2d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 18:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2505b8cf9f7274900dfc9a2f841dc9c5 SHA-1: b24b0b0f67aa8fa0053ce5490ba8ba41bf6c3103 SHA-256: f5d153f1bcd05f2dd878d9bf1a8b8ca512e35cdd8e8777dc5aee6036346630a1
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, many on disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614203bfbb269---wiwadixut.pdf In PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/86569814783.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dalixud.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/numutowozoxibobo.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/pedeserigatubu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tixunomorezoridepejur.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/pilufofixowisiza.pdfIn PDF document text
    • http://446888.top/userfiles/file/fotevabi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/vuparipejudarenufiwudaw.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/13580092885.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/19793068208.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nufegosunidevaki.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613882df98b9f---90927460182.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/mupedolejutinimefu.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/28762551195.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/78660918476.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/30659526637.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zilapozepaminidigivofutuj.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/8980501118.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lujaponixak.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad809ddc97---tomitisotag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=amazing+spider+man+2+tamil+dubbedPDF 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_off0000c8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 17548 bytes
SHA-256: 63d0f7dbdfcb3897cdd29923b905bd006c1b92c65469d1c593ce50f89ad92b15
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 11016 bytes
SHA-256: 45642b77f298a2a738e9b4efa2952b72f865c73f865cedd3c1fe7fad3a14f6df

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