Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f9ebaf671ee0af…

MALICIOUS

PDF

95.0 KB Created: 2021-07-01 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71a9481e500c0bbc6101789472f5f4d0 SHA-1: c2a8606895b8933a90a8f40309c94bcdaa66c304 SHA-256: 16f9ebaf671ee0af59ec8b3a175f2a62652cf26ae4fa0f985c1f2f386abb6f77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14fd025aa---63224201753.pdf In PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/17901866843.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076f674be22b---44571593524.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/49620526608.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0gk239hsdgo93tqp2pcc5oee95/91369805435.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20d9533ad---78033990084.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xizokutejekusidixatawebo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/93335746ff589185c778d59a6bec3d00/lumuwefavuzogarunefosu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a81ce70fd1a---visolulu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f11e261a---54294329375.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608596c7bc5d2---loxusefumazikukotefuwinix.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f43830f7cccc7f250c308d1a8f0e099/numas.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/31499611714.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sesopoxaxuzemumolagufezax.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8718912b---xanugiwiwasuvuvefifuzex.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b314d8d10---xarijurug.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/28ad1ae7e27fee0235f159e59c7055da/posozifanirofigoliriniduk.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/ludafopojepumuku.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ca997cb7---gefubosaxewagisazi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/narigunudelifolanan.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/kesifekexikarap.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/88d9dcf1a230fd2be93f2c6e2398cefd/zofowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=joseph+campbell+12+stages+of+the+hero%27s+journeyPDF 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_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 16952 bytes
SHA-256: 80c9f1aec62c8d6a9c4b832e60d8e7c2d9db9b8012e3ecd6f6bc73045e0593fe
font_01_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 11516 bytes
SHA-256: 9c6b0c0536c95c7414c6334f9d3ec95d9387876863c448d55d73c9f5bcee5c78
font_02_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.