Malicious PDF — malware analysis report

Static analysis result for SHA-256 163f6f8af3da98d1…

MALICIOUS

PDF

87.5 KB Created: 2021-08-29 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aeea69cbe27616ced175662d4dbf3493 SHA-1: 9f96dce9bf229409534dea8eaabc63cd44cee3e5 SHA-256: 163f6f8af3da98d17d706449d8a8857e77048af4851ff88d55dd3dd1e478eb57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign designed to lure users to download further malicious content. No scripts were extracted, but the presence of numerous external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=meaning+of+colonist PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f2b6d59c0e6a293a4f162d8d29025b44/funakapukivijewolopesa.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/7236017359.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e891f32f---gagaliru.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/11397957621.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/puxakuxazukijigul.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4e051631f9aa32915986f501e89eaa36/70275660103.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/dalavumivezab.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/tazus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/12bbc2b76e1a1968b892f635ecd4987d/mukirumit.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976502a8b5---fedemirumoxe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62f26f97c---82413208861.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aefe21222e626d182038a978e08a5a44/11726848149.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/357254977.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/luvanisifode.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/luluse.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/zojakoravixabef.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712b16811ff---99312076526.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd550402480---kovonivug.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/wogesuvo.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/zojuxok.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/3062221685.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gomofivom.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 23528 bytes
SHA-256: b540ecb2b221ba0a9e3242048a986f72a857941164a39f59802412d2d89d0108
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 10404 bytes
SHA-256: 1b71e1c38ebce22894d64d9f4cd4c60726570b598cbb6af0071c31a09f773396
font_02_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DA 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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