Malicious PDF — malware analysis report

Static analysis result for SHA-256 43883e5b46bf8191…

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 04:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48712bf12e5fd4dd6b2a40e6a8f8d913 SHA-1: 69bc53ea955baf521d12776398d36a5477e05ccc SHA-256: 43883e5b46bf819179a447444d388328eb69ddcfa4a01fb3fb79fe614aa1249b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code, potentially leading to client-side exploitation (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gold-carsales.com/js/upload/files/pugekofozelimi.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080213096115---wijurope.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045570648a---mawutajobu.pdf
    • http://ttccid.com/userfiles/file/wagaterutudiwapom.pdf
    • https://medosojewellery.com/userfiles/files/38495130181.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/10832138385.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca8fe6a2b---lelotezo.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16cbea75fd1be9891502b633d90d38cb/97106543561.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608807e3d1616---15970273841.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1lsnr7ag8qevta8nc13en5lgqc/sodumewevilebago.pdf
    • https://chptravel.ir/data/file/40363478689.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/2831303494.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/68422544850.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec16937f11---nimatifolex.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e7a81a9ef3dc47e6fcedbdd743b33f7d/90344107309.pdf
    • http://ifa-astrologie.de/userfiles/file/taxutewivironigo.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c6878307022611ddd9d5289eb1eba71b/38848904016.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/50nqvb6ssjh83dp1cud52eaojr/5068530308.pdf
    • https://eobliecky.sk/userfiles/file/11185325966.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3336ee7b---58835806656.pdf
    • http://hayatteknoloji.com/webimage/file/lirigipozararalavaku.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c212060ce43a59f2b4b1783c2deeca0/rixetetavewalinibile.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/295ab79b2b857c9996c56689604151f5/kepazafuw.pdf
    • https://weddingitaly.jp/images/file/11745420165.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=in+the+12th+hour
    • 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_off0000f8c5.bin
b3826c62f4837475adb6352a7015da8eba6d546a743ea57e13ee07845e96a31b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 9960 bytes
font_01_sfnt_off00010ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
font_02_sfnt_off000126e6.bin
1bc44fd608309a19abbec768e57592a1e2050bb452de4411a83b8d7b931e3297
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 17940 bytes