Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6216007fef80e6d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-08 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e05d68fa86cec60af1687bc70453e944 SHA-1: 9e8f30f78081a48c916ecb2a746aff5cc372061f SHA-256: a6216007fef80e6d19bd9211a543c5464fe33963e8ce82fe5b0a767e4087c15f
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution pattern. No scripts were extracted, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=rates+ratios+and+proportions+quiz+study+guide PDF link annotation
    • http://aire-limpio.com/img/editor/file/lututalafizofowubono.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e8757865---kogajatirepupojabesajapi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/01624fe036aae98fa718841e8d59de6c/18730768060.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f95282ba652e879ced336aebc8f5516b/gofalifewakobotizi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc27e49b45---zigower.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wozijinegalununazun.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087812403aea---suduvuke.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590c565e9---45073736616.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32g1fpe37m11959ps42nlsecl2/natuju.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pisagufadetemube.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75bd240a4---2797507736.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/daxoxezumasomajunamuvosa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3f2e949cd67ba59b1d2dfc398c43d67b/gekawomevava.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/39838275452.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/39820564808.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/mumafus.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b527f0e2ce---jenafasib.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3ededdd6ae7946ea145295b6f233b74e/jotitomaleturo.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pizurimujamirabebezud.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b3b109590dc0e2a2c9b00da7b33e88b5/dikubuwejubu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160888ab827b4e---kikixifelipimemutoxowijej.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r4vtf3ueoo9qasjsdkv3ml93dh/zikutojuvamugu.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/79289740863.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dd84f2f45b64a74d617e74dc44c09599/77942025369.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 10988 bytes
SHA-256: 8e4387e0db216b1e2da2c695ae9dec0380b3114756e0fd5c128a05664979091c
font_01_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 18516 bytes
SHA-256: 5c0b495c2edacf347d373fdc32506e02ea6769174851b610c6098c8e628b747d
font_03_sfnt_off0001476a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476A 16072 bytes
SHA-256: cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7

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