Malicious PDF — malware analysis report

Static analysis result for SHA-256 0669b6cd33a1341f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-07 07:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 378fa5869c6978c4d5ea0ede3ea3dd72 SHA-1: 7129e4efaca01bd589f2623cdf0f822945450b6b SHA-256: 0669b6cd33a1341f7464448a313dc31445aa5a215be69a2da69676126deb9bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to other PDFs hosted on compromised WordPress sites or disposable domains. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50726085f5---xakadixaketakorapod.pdf In PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/78354676426.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ute78fgcdik4vcub40ddl7httm/vogimipomisof.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/dedogemoseg.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/3467410100.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jifamijaralidexod.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kuzanedegem.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/85451945933.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/zefoxaxurifemewizuk.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jupixojobavurekezivenu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/63234501977.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/pbfcrkd8j3l901bku6icj4b5m8/povex.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c012cadf9bb91898376f32d590eafcbc/totufodel.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a244b8d1f9---kafumupexonedamotusiza.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/latibegaj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ed5ef2fd97f3d49a281f54ce8fd302c/kufikevefa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e25f40a8---faluzusa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072330644309---68291369110.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073289ec29c9---rubusupelidawakovalig.pdfIn PDF document text
    • http://18554080.com/userfiles/file/59221837480.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8ed521f79b6493852def504052de8061/58248108341.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0671012b936ec77039bd1e18f06f785e/51125705529.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/bamuzen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hachette+mission+indigo+cycle+4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 10900 bytes
SHA-256: 7aa793945386383990355cf65ef680d929291bce45f0f4214a2df9c0c35d9c1e
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16092 bytes
SHA-256: 5e4c00560aa92e58ed7893f1d29e19bab1551ecfc1a2d4366013d39ff1dff337
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 18880 bytes
SHA-256: 0440b07ee1ca56ed3824935984fd160767b486e723bf442aefbae3df4645601d

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