Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc01d1779e30670…

MALICIOUS

PDF

74.7 KB Created: 2021-07-16 02:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 813538caf064d7219c1e9fc7562a94e4 SHA-1: 2ef4afdb0b04a7f9ef8d3e7f7700530ca50215a2 SHA-256: dfc01d1779e30670388175c060964e06fafba9faefdcc7a7ad9fe4e9086fc983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress sites, each hosting another PDF. This suggests a multi-stage attack, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, with the linked PDFs likely serving as the primary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7cc537889450f1378d1303f384cb4edb/kuxipewotem.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fnbspv4p436u5u4g23fn2dshas/41034557801.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/683213b57188bd61e95a042657c91e85/toronawefifi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/846ede32e1e8ad22a6e604728eb92b73/40787989942.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/49ef1297784b83ec8a7f6c3669f6c0bb/bawuzenejo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a1f29eaccc7a8adf84befbcbf7c351d3/53727899678.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/95499008078.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kadoruzoralanekixume.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/697hmvmh3mi3348vpiutl6cc6m/refaxaso.pdfIn PDF document text
    • https://discoverthesky.it/file/76168942031.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dca19fae95a---17103948995.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210612144359.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54e09b089---nutabamaromalujulilebediw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hjrcrpvmr8tqtiholj9co1e9n4/renawigadogirof.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnjsmdhjujmn3j1cs4e1m64rmn/vomukuzewuriruwifibimita.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/53622350909.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c7979a0d---11289903737.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21191444756.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/adc34cc08112e2cbb12b9c3dc58b74f8/vajikisotudova.pdfIn PDF document text
    • http://webbuilders.com/files/file/setitapogorowopadisur.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/xumidox.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/04470acebe55e5d42f5d39ff7f0a8c34/11732518202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+acid+base+titration+lab+answersPDF 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_off0000c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 10640 bytes
SHA-256: 1e0f250138dcdd87e70f8523eb52971053bc0c0d2f956051f161b34828b66e72
font_01_sfnt_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 17288 bytes
SHA-256: 7ba68602eb0fe2fc95f4d4cb8986dfdf25c060597d1aaaa4c5aaffdb17e59880
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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