Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7710fc91763781…

MALICIOUS

PDF

92.6 KB Created: 2021-08-13 01:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 32b984313f34a6226b5ce7f6d39b870e SHA-1: 9a3f40367103cbe44cf81017d275888ebd35c49e SHA-256: 0a7710fc917637816feb807035203d747471aa9fb9fd4c31f8fe66ff845dc0e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The presence of these links suggests an attempt to lure users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1bb415de76ac225e8927b707568f6483/garulavuro.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ur6nsmriapuk6ri9o1rppg0gh4/23900128047.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210620120333.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/mujimusatowevazisotu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b85df794---67919758047.pdfIn PDF document text
    • http://billsky.ee/files/file/fuzetifukefibelemaru.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/44534477698.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d84bfce5---dudazodix.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/13741544117.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/23884779773.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/86427629196.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/lufirabaseloro.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1tqvrqet6s5qqdog6sn07bdu1/lilamogi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115038e1ef8c---805866642.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/85752534890.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tibemababofejokoru.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/31264645602.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7c18f24c77200ea86ebe505a15b86a8a/83776156861.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64e813971ac764cf0d664c56d70da408/gikerutixa.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/mozunuvosarozosexineda.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/10800628710.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/zuzitoledutuboxeded.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1b732c9e6206b9e6dcd731bdb412e3a3/30290205300.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/9930394604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=saxon+math+kindergarten+worksheets+pdfPDF 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_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 17332 bytes
SHA-256: 48d9cd92ba1044d16b64530cd4691c77e7e9d7d30d8b93c7fab6d288309bd05d
font_01_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 11256 bytes
SHA-256: 679c9809f0bc45e1dcf615b709e355143c614ee8717f3b40b51e97557edbe56a
font_02_sfnt_off00014c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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