Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88dbf2aa58107cb…

MALICIOUS

PDF

82.3 KB Created: 2021-07-03 10:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0dbd9fdef8ed256521214ce3be51e805 SHA-1: aae6cd6a31b96682a4a7d43fe5999490d84c3b8b SHA-256: a88dbf2aa58107cb021e21571a15193f4da79815781110e7f0809f7b91ac164e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=jerry%27s+express+car+wash PDF link annotation
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/bisevizopetiriwumise.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3bef0792f1412f8717fd1d4411c99fca/3748597258.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1927dc3bad318135c5b637057283afb1/sasosivowujip.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742ce098750---44929757511.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gli469pu3pf5d0q0ilijh9sq61/pibejetizejagop.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d8d771359ec388e9c134f139b29acddb/wozepidurosavixopir.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9c16a58c1eac66e34aa088741264eb95/petiresaxumisoxer.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/feb567f1554ce4e7965d92a8bacf5a95/bopalonitevabizirunesef.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/libowuxaven.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdbe9c5ae---bixolufotu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/2483966193.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1be1b575---36484530095.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c250dfa7---57714251535.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/poluja.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/15294842137.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/xutapesafagadugolikovin.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a833d88d06f---goxaduw.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc79a332e---gezapojaza.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/lorirufixadovedex.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/39327565495.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210606224131_2roji3.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b52ac4e1---rujetudiviwojokizafefije.pdfIn PDF document text
    • https://parfumzone.ro/files/file/nimev.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4b70d1dd863dd53806770a1f17686de4/bavokoxukobisijosopino.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10340 bytes
SHA-256: dbafad606db89c240f8e4bafd4e37b225b675a521cdd4af493d9c40863f0ae1b
font_02_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 17680 bytes
SHA-256: 1525738f5578ca3e535e9efc594747571530653cb4b94b1dd018a74e8fee1f25

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