Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab2a66a84dd9214…

MALICIOUS

PDF

86.0 KB Created: 2021-07-29 19:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97c8366c7e24c8bace6fd0c6f1125d5e SHA-1: 68b4b048cfb016734805d2ce014992b9d729d674 SHA-256: 1ab2a66a84dd92145e6662fccaf61d3e8eeb06817eebbd2dbd8eb01e60addff0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS upload directories. The numerous embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery. No scripts were extracted, but the overall structure and URL targets strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3049412---sakigajo.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/rumikodeguke.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/58986323895.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/kefejuzume.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c39e691493559c3905c324b10d62e506/jafemusawojinirepa.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wolida.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b762b213dbc---ripedotiw.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0853a7047069ad399545d3e6a5153134/nepod.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed49225a---didevesaxijofoberi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3a1939f111bb8d15e619c027562f1ebe/76929208403.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/votojo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/93329442678.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kiximazofimapupodamule.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ab2c6994---2304620984.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/32b901aabd85aa2f20da96dd70295db1/fafusenolakef.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2385a77b---97819223109.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ttqcm9rct15a2a06sbbrbck0i6/57781417046.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/benemozibatezan.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/62037486024.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/xajafisedetojupof.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v9ni0f6k7fmps829t84suj4reh/nesavo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/fepezi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/voremol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tribal+dragon+arm+tattoo+designsPDF 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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10696 bytes
SHA-256: 7e589e99f08ba6cd597cd419bc87082883bd4be99e1ab3c33b25a08df45070fb
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 16268 bytes
SHA-256: fbfba60dbf763bbf25e86bcf008202b60fa90ed37165dcd147926a21ede1305c

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