Malicious PDF — malware analysis report

Static analysis result for SHA-256 578559d5bcb5f750…

MALICIOUS

PDF

110.2 KB Created: 2021-07-05 14:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0124fd8d5a34fa8e7177f0fda6156ff5 SHA-1: 6f5ef0e1f05116aacb759b2066166aff22972bc0 SHA-256: 578559d5bcb5f7500d9330a9e4fb7dcff5d114671a4943801db35e92e1f9afb3
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of a link farm on disposable hosting further supports this, as it's a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/tt9kt3jejj8gefpssaakfheug2/35793260055.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m6nhuqqvt873ab2dg7tf99ngil/89374770256.pdfIn PDF document text
    • https://davaocarrental.com/images/file/xegamogumevewodu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1115cc30---93380717251.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d7a062fc---31196797108.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/la9r0p22gob46vem7lgrpibqkb/zizazewobib.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/sufozemukesexaliwupamaku.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907cb6704e4---60955765636.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/jupatox.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/30879724888.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9cf17d42---69023836584.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/gosab.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39bec11844---foxuvalamejor.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2c5d9369---bekipadelemofexatibiziw.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8cdaf125aedd851fc18519992baf1589/42119396928.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/kuxejodilefatafufivi.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dosuxibaxilejuvurajewa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b97a772e66700ef3e21af1585f5eb0ce/17116434482.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4a4813e7c6870c455b7123a3119fa6c0/4850397788.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099297df9f---ganoten.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8d925c6073a2f2c016fa69a4ebc32e68/gusigedinujolasixupoge.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dd04bccbb4821ec775a9ecc086e280c/rulitaropokikewi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/japisirepavanatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=refractory+ascites+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 10580 bytes
SHA-256: bf5ac52ea6bb4a7d17f255670503c818311f6e7478e4ab6987e94d4f2097223a
font_01_sfnt_off00014d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0B 16784 bytes
SHA-256: f0c788f0ab8ab9e0a136d5dec5d044a3d2764d306176d37adc56d4debe18cb59
font_02_sfnt_off000164d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CE6 17552 bytes
SHA-256: 0b19da91c8e4e6f13315f202136f8d37f5fe902e027db4b01dc245bfa70cafcb

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