Malicious PDF — malware analysis report

Static analysis result for SHA-256 7355502eb1899a93…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 02:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97ec2ea7a0d4169364bbbd307a5a45ac SHA-1: d2f867743ce0ee82f965e2237cd23dbde90c2e3b SHA-256: 7355502eb1899a93cf5c3ecf68c8a87a5b35e5ee77bd967cd8a2f4fdf48a4c4d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure, consistent with a link farm used for phishing or malware distribution. The `utm_term` parameter in one URL suggests a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://allytemp.ru/uplcv?utm_term=shiva+112+sutras+pdf PDF link annotation
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vuvovagejawumibexag.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210829235559.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3d3fd666351e48dd10054b22e676cb59/12499351382.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfb0081519---5319524228.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gowug.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pilitijefibodekemigu.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/pobavutobovumu.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/radizenejawo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/89606379830.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d3526e4c5bbe6989a4d9f12e7b1ea536/safuwonadudimetu.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/47995532403.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eca2dac9---lumamo.pdfIn PDF document text
    • http://rinsacars.com/files/others/rekatepuxerexeb.pdfIn PDF document text
    • https://krossi.ru/images/content/files/61372201801.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8d23de894e75b4b96825c13a2142a00c/totubajixebatagu.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/31299712695.pdfIn PDF document text
    • https://rintrans.com/files/44666854247.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/zitagewevi.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/36915960658.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/77162482894.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kixorawox.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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 15992 bytes
SHA-256: dcd60a4da6bf01b7e926be1e75f2ec9353b11553f70072837224950558dc57f8
font_02_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10608 bytes
SHA-256: c071c9fdc2fb702decb30a27673a1e98685a5cde1a13b8a156b9824a72c868f4