Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2c7b995944962e…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 19:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d1be91a2912d811134867809a52f0415 SHA-1: 87b2f0806c149111f7f961543aa93f1d400993ca SHA-256: 7d2c7b995944962ed60c00b748d6b52df50fa82d81aa43daba8aaa50f7990cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload storage. One such URL is http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070229cdb50a---lepatexibefofopaloxefi.pdf. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c730af6bb2e---jefafimozugajuw.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210619052555.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/midumotoxofuvevurasetoni.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219842901793.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/bizifonuzemenivalipagobog.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/sulovavoj.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/netebilo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b363744037---93370438201.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bemafexavusuvenetofi.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/46772248436.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6410dd157d3b3d0f91983ba43f48b35a/93791241471.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/429b9748952a354452fbd0601a2d4475/30003952329.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e24561571---64868027699.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/56177293300.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba17578a7f---xikarapinebimupiwadosomi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160921def2dd3a---sogaso.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xabixobesosomidas.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0707d22bfc---wikajumalubigevetuwun.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/247f551c3fc05840cf26d11a8a763821/75273122635.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a52192381---masabumifebewev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c39e691493559c3905c324b10d62e506/jafemusawojinirepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c748899da4---48555697260.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/22103690611.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc56c7f85---68239256247.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/kesavil.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d4adcedb4f7dce95fcc3fbe046728b9f/12390522215.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070229cdb50a---lepatexibefofopaloxefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+pick+the+right+hairstylePDF 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_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 17420 bytes
SHA-256: d1a5392b2683d9bb362d7c4ebcbe2fc1f1b61b6283b02b438281ea9ded3e5ae4
font_02_sfnt_off0001423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423E 10832 bytes
SHA-256: e68ce3cb245a4dfd065755fc6f71a738af056ffd8cd9544bd24b53684f1e480a