Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cc2c06a00da9a7…

MALICIOUS

PDF

103.9 KB Created: 2021-09-16 11:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 984603be04b1593135de25e077fa5c7a SHA-1: bd15b4b640a0c022a74159b35e696b528d9c8bad SHA-256: 61cc2c06a00da9a754c73c6df6cdc4e6c01dfda375cfff14319d2ddd2ab69ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=silicon+valley+putlocker PDF link annotation
    • http://grossbuch.com/upload/file/fuwitefakebudedu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/22688076067.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/204078dcc0248d4db1b6a94d8a60aa25/22266768509.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/3182773782.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/gelusozasopobolosarefitus.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tisuzadekobojemubodugut.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19649453929.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vokimavuloruzugepe.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/32784872951.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3c51481b8326f9660377d5d76417d18d/89660342558.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/lobamidalemizimugefomiv.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/76736158619.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142df69cb127---pewobirinefefudoliliw.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/9042448178.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133de8cf2d0f---41846431893.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/98447810588.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/44388942010.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/dajewapakogaleletapexep.pdfIn PDF document text
    • https://socardan.com/userfiles/files/99344814557.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f90abdb97---72830443454.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d2mblurcc8kn2jvji90pqops33/batetanitiboroxaref.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/38927084337.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/lipufuvolu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/31ea2a60a27c65028666023080e8a1da/62524736569.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_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14538 10644 bytes
SHA-256: 8d7494bb00f845e96b6f9699b02c50245e103a1a57b23be0e546c869377832d6
font_02_sfnt_off00015db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB8 20316 bytes
SHA-256: 805f59a3c59f01d8e8e01532ca60b5206d80283c771efe3df1124b999271f626

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