Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19e7b3bb6e1a27d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 11:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72f9aca9b811aa717637c1777be61310 SHA-1: cd867933f1b35140b2ffda38edbcffedd1a23d95 SHA-256: c19e7b3bb6e1a27d56950e24ce1d87fb5106dfa24ad49a306332da38531574fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or redirection mechanism. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bopatanopuwumidazasubibux.pdf In PDF document text
    • http://carrozzeriabosini.net/userfiles/files/56220867.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/90115944842.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ea7d3aca783f146a91f55395543b51ed/55877518022.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/gifikezazedofezi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89a3c990c1---56971113777.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/mupafikig.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef39ac15cd---26121598158.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/8515696107.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7i6ubvjghm0u2bpicodq2fa3ht/58159488086.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4bf02d55a76da2b46b2826b0a95dc402/gujanukodasowadurudidugit.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1c2bb799---13178538308.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df09c9f661---niwudugapadupikijumipufar.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/96783368903.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/zezokavesilune.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/lebajagaxotudesezuve.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e2cb53a8---titurotom.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/44996754860.pdfIn PDF document text
    • http://haki.vn/uploads/files/20314011495.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/pekow.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/62372769939.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/zifalorelemages.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/21797926678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=caballo+de+troya+libro+1+pdf+gratisPDF 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_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 19280 bytes
SHA-256: f14622613cd39775e8d2b6c85113f02ced1dbe0bf30778cf2e4f6572a1087e1b
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10908 bytes
SHA-256: 7f89179163d63ec0ed888748ff63c0298b2947a824f31eb1a0f236b7bb4cbf27

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