Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dcc4fd77e54f58…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 21:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9f8aa8074773c33bdf976c3fc3dc5970 SHA-1: 1b1a5a3efd77c65143e4c88829d8f9a369ca6b6f SHA-256: 38dcc4fd77e54f585418efa09e87dab445bb3e15154dfdc74975f795592c9edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/uplcv?utm_term=411+mobile+reverse+lookup PDF link annotation
    • http://wildpflanzen-planung.de/file/29862761613.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b440cb0b305---jesisegobel.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/nutozamaxovedoxodonovodi.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/2747181806.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/40435041617.pdfIn PDF document text
    • https://arerp.kr/data/file///lurijabedexakuzenisevula.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c5d00b15fd93e5f467261856f15d2b8e/50796114994.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/navegagafebawirolijiwa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae49e3030f---78087605554.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873de018424---89039434862.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zodegejowopi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e9d326f15ab0bd6da776cd14f257e775/34544776066.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/71158138245.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210728111510.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/83550976933.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/wawopepenogunirimuv.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a596364e44d---duvesi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/liguke.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/luxuxezolinu.pdfIn PDF document text
    • https://banghenails.com/upload/file/xavetilufiropowoweko.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e313ce8ba0---14628245622.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/badebinomapetekofelat.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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 17972 bytes
SHA-256: 2778cb1f2d9c4e36debd6bae426bf9e595be053922dc2450a7135c67946d0219
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10480 bytes
SHA-256: 94e4b53c99bf32d52d8b3f8122ea0934518c74186c74e9213bae5bd4441aa797
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1