Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58112d4b92e3011…

MALICIOUS

PDF

108.9 KB Created: 2021-06-28 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431cfc7db8323258319a36bc5252ea55 SHA-1: e3f2653fbf68f8e7c043c12a8ce3705e2783bd80 SHA-256: a58112d4b92e30114344368b089282c571e3ff09c50d5c199dc10e18e8910fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/uplcv?utm_term=different+types+of+anaphylaxis
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23b395e6d2---57087383650.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b68867591b20dba59f479aa068bb3321/lasateripunukuwo.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805183527---30035586585.pdf
    • http://kulturazebrak.cz/userfiles/77095693999.pdf
    • http://tele-fonika.pl/upload/file/84341687486.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/oi6sbnbefev4scs71c6cmmr8u2/50035270754.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/lefagovumogebigo.pdf
    • http://shinex-auto.com/userfiles/file/viwapesir.pdf
    • https://rhodium.vn/uploads/news_file/62294417055.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b75bb3f3d54acf46d8f4ca568481eb68/roduludexorebimonumabu.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/84643149117d11d255e5e207bfa3a490/gugol.pdf
    • http://ztkammer.at/uploads/file/rinejiwaladozotir.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6ada7e2f57ebdd52cdd5d874f8fafda2/12275017844.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf777d9b9---1969449365.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160797ce6327ab---buxulovu.pdf
    • http://gloria-eurex.com/bisukuvugigajuxapujili.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921748647f0---55989277772.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tavi78vk3hlpq0n864if3l8uj7/fowimozamig.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a618a95bc---vukelemakujorum.pdf
    • http://ahcxdq.com/uploads/file/29173754732.pdf
    • https://weddingitaly.jp/images/file/54961684957.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607380bc8e576---zujalumotarotap.pdf
    • http://envigest.cz/upload/file/fuwixogujubezejo.pdf
    • https://epiphanych.com/images/file/56443326861.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/67781328099.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014260.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 16792 bytes
font_01_sfnt_off00015a72.bin
688c2314df34038e81eb513c97c825d36ec67e6d3ab624ccb42aa1b947fc2be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A72 19560 bytes
font_02_sfnt_off00018dc2.bin
0e03ab5180aafe0565be68bd3058bc84b03b4261865f7d4f44032f1a3d6c9c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC2 10672 bytes