Malicious PDF — malware analysis report

Static analysis result for SHA-256 532013313996600c…

MALICIOUS

PDF

101.0 KB Created: 2021-06-26 13:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6f1a9739bdbce0cb6ba0e3149ca8d88 SHA-1: b4ddbb98e1f04e1b14274cd389a22100515dbf74 SHA-256: 532013313996600caa71c95b700485c3c5e551964d0bbc38ae2f201d0c4c68e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://cructi.ru/uplcv?utm_term=fake+gps+android+without+mock+location+2020 PDF link annotation
    • http://didopack.com/files/24996498848.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1814efcb8cefb8d486be2d025bbe5a91/87389935982.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/kirivesidipetibivelobobo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc25bee6e---9053680537.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f5cc0f0d---situperetoseki.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1630eb60c005a3d9814181f1163f0029/satagufopodavofo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa71b0ff---xuzijimefuwikeriwa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a8899f28---97306108333.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/fuvule.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8414287175---4994763548.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/96817833085.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b6bf8bec171c983c85f10e590ca56ac0/87398066383.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o7cbi1977oqbc9p5lgo3lon1s7/90824964064.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/baf4f43a2027fccbc5f5f94bce1bf201/ditunojipamuvobo.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c131705d6e55b483877ff1ede78d3d8f/18555159871.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cee24485---24016972346.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf52bf6a15af400011e2fa8103ca4a92/12745420267.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-4/20210604151946699253.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b26832e4b64---kigidepamasabaginev.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d550e3589d---17437501119.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/foxikinirij.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/28855654386.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13abb3c52---43851811245.pdfIn PDF document text
    • 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_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 11456 bytes
SHA-256: ff2ea00128722b66980df608d3de15733a2fc9e000d9596f9094f48771693660
font_01_sfnt_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 17716 bytes
SHA-256: 032fc030762451009341ddfd18dc9fc06e195e1e59d2e69abc6dcdb75dfd923b
font_02_sfnt_off00016e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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