Malicious PDF — malware analysis report

Static analysis result for SHA-256 7601da1f5ce5700d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 20:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19202e40f664ca5a01f9bd985bdd69d3 SHA-1: 1a85828af7cd970210296a2c6d1f4cae3640a645 SHA-256: 7601da1f5ce5700d713e53ece44178983e92ddf8c7973d5cd30244ff8d199e4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further supports that the document is designed to trick users into clicking malicious links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=becric+app+download+free PDF link annotation
    • http://eprdel.cz/userfiles/file/vabipowidizak.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/51795034452.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/72468232947.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/69301183738.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/73896726055.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/vonuvuxoxabutekodejofuze.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/935450530.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h8c4kbj4rehh28oo7ul7ncsoq4/25936787966.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/bifuwudabapupow.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vapoxuduwipami.pdfIn PDF document text
    • https://mytopics.it/uploads/file/buzinoxumos.pdfIn PDF document text
    • https://pratham.one/file/tomapadipox.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/20905092205.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405df160477---woranonefulotofogefof.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f302b59165cc3e1cd9d27269a9fe8f4f/pekopuwax.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e63fdaea6---ritoludokakas.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/pizubef.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/77742234602.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/84136428912.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/71983877801.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/52840001906.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109151008228906266s0n13h641dy.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 18052 bytes
SHA-256: e8733c82cfa76ce109ae06f29f454aaf552ce66e4ea24f6189d8c69499a7efbf
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 10484 bytes
SHA-256: a6bf4132e504079a288f21046ac15c21f0bd0e770043d0bfcfef4fcc7c86282f

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