Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5e1f2f15c56516…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 16:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e76d2164401cdb92241921ed513c17a9 SHA-1: 0b7cfe730fd1fe2b6808bec1cfccfe38bfbdea5b SHA-256: 7f5e1f2f15c5651684dbe569196322cce75a7cf056e0074686d2962b9baef574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://praguetransfer.com/files/file/60313740928.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/144cc3efad5b35996e13e90ca8ec6705/patusuxarutarozadilizik.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/metezu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qujf0633p14974edko36s2q29q/12783163797.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1421117969---kujojerunix.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/baximusujar.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d45951bfc92c23b826215b80c21609aa/lemesozozawot.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/visevimazediveguboz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5a042e3cd1fcfc1cb3abf2db74dc44b/13251672234.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/fomudunaninarojivavitojof.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e6fb0355d8dcb371eb6db7d0839c3b5c/muwijunokukilak.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/leluwogewovomozib.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/pudisuki.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a57696b6---folubalapi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3404bb158121b43e0786b4b5028d6a0/12063577248.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5a93c85a---12172917314.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zinegizerexudew.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160707e5b2936d---36358593214.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l35krppogv6q6kmoechu1jask6/vamumukebipudabeg.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1e9858fe---14422188480.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ae6bb72c139bea1337199109ed19f315/76862248878.pdfIn PDF document text
    • http://synowka.pl/galeria/file/ziberu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tamilrockers+movie+download+hollywoodPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 17740 bytes
SHA-256: 69856c8aac4766a0e4a08ab3aedd879e352f37ad7919dc83932144ad1610d697
font_01_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10856 bytes
SHA-256: d85618fb6324fb2f9fe3ab640a8677e5cafd15935297e44893b3836c7d8e329b
font_02_sfnt_off00014263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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