Malicious PDF — malware analysis report

Static analysis result for SHA-256 b018fa0acd97f3b8…

MALICIOUS

PDF

96.2 KB Created: 2021-09-03 22:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a1c4f0a3ef7c9885ffed7649c9cec55c SHA-1: 155db7f5285635f4210d58f301a2ae3d5986f9c2 SHA-256: b018fa0acd97f3b88b5ca37b5538c787709c097b16031b3152e1e5883ffbb21f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wonderpanel.com/app/webroot/img/file/zudewoda.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/17881899327.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903043335127673ifm85c.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/dafowigisedusifovelumof.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5c5824f9---33549125406.pdfIn PDF document text
    • https://luminex.pl/upload/file/16828137670.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a76d64595---radijixidarini.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fasebikixenovit.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33fb279c0f7d0e42339717f3d94a3727/kexevodojiz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10c14138aca5065036fe7c9abe7c5f7f/kelajefakesipelegurub.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/guruboxenokisunala.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/92803372771.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/71804410384.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76459e3f9---fetematazorowuxa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r10b26h8npnvanjulip2saq8lg/34747926723.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qs8tavorl20k16i7cb55q22k47/lixadazuwitofon.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/sowesavofegimejaxopuwebi.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/31142896658.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210813024800.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d540c8bbbce---74483913238.pdfIn PDF document text
    • https://rintrans.com/files/jovexafoforafavu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fazedakuwavotobegoniren.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ee317ea9---56273694008.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/44002642823.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f109e9966b---61354339737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=safety+manual+template+manufacturingPDF 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_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10824 bytes
SHA-256: 365585bbbf36c433977dacfc55e08cb0ba5c60bb12fa765f6ed6180b1b8731fe
font_01_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001461b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461B 17472 bytes
SHA-256: 3a53264438de3d396a02634d35445c826a75657b27a9d12c5b776fac0a983274

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