Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2280e0104dcae36…

MALICIOUS

PDF

98.4 KB Created: 2021-09-01 01:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f9f442fb1468c43b8e0461f94212597 SHA-1: bc6a1705ccedc443d40373fce4d589297c6fc6cc SHA-256: e2280e0104dcae36cd3e09f6e081ff1caf978c37e6839268db9740d4d4c55948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URLs point to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608303e2ab5c0---dilikajeneki.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e4d1cbb0358c95b8730a3d4ddc10871b/wewofajulilexuvuga.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j6bc2p4adaaafmsoupd67vr133/fagimabusigekipoturom.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/9911091410.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/naxajegisutafazuvonuxavag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3f54d4e6---40770897612.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/knvh324ia5cu9tl53mrushb191/sifemenesived.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/698a14b6e3ac2cb11d5ebd2db841c6ea/65744703324.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/29995020034.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/v642gafb5iq1vo716rboovibds/mitazumejiposo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead6154d07---71084448222.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/gefukilinakuvugenekew.pdfIn PDF document text
    • https://combrooncom.com/contents//files/94947773696.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608164499c75f---jagabapivobanenelevabi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cna0uv5u80doiue2f0olmit7l9/megomep.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/77718071538.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b7d8c82b624ec806b03f1b325705edc/41803776193.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zadaweded.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f85b551f0---latesozivarelamaso.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128ce395fe61---13205428100.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/sawasawekavuvunubumaga.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g2u5qsk68lpfr0p272p0mut6b6/75999262409.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e492dbfb13---64136934165.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/58645984734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=problem+solving+and+programming+concepts+solution+manualPDF 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://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_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 18060 bytes
SHA-256: abe8469400aa7caa76078871e7eb5a315e1b9c08391e1880f63901be47ee4026
font_01_sfnt_off00014f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16717 11164 bytes
SHA-256: 45ecc6c7eaeb8252730ea24a923b3ce99b926ef6af04a3453299c9f55e30d03d

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