Malicious PDF — malware analysis report

Static analysis result for SHA-256 412a45c53bccf6b5…

MALICIOUS

PDF

90.3 KB Created: 2021-07-14 04:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f8b55a358b2907c2367e8183c8e68f97 SHA-1: e5042176db32e1083ac05070f459cc8e12e61f89 SHA-256: 412a45c53bccf6b58832f15d53396f7b85b3c7b1c59c76e5d80ab99f5863babc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://crysiq.ru/uplcv?utm_term=dramacool+view+asian PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afbfba569d3905c6de8bb4929dbfe7b8/renikoduvixaz.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/femawafakado.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210623_005425.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/mavowufot.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/d4vdid5avrb17pve456hofvo1g/ribedimof.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rttn89u6bh610rn5371shso82o/11856405519.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xizirug.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ebd7f232---66501749172.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aac5a4651---91923819893.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/h7qqkljvl8883sl1s8claqhrtm/detow.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3cb7b4c23---78016785879.pdfIn PDF document text
    • http://arslanemlak.com/E/file/72968571576.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4d9a740a---17052559651.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ecff1d68473bb3ee6fef158b033654f/sikiredewudav.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/25411311850.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/bifeligabuxun.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad961d31247---86778420208.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c929e308e2fb7d698ad1c8c8a0b6548/gozakafi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xisavunakokujoge.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607661ada2f60---kiramizosowanadari.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2442b352a70e3ae4956389122a1377f0/wekatagowodetimulivew.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/42070302575.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l7kqg8n4i2d51aqr2kfak1sesm/8273327135.pdfIn PDF document text
    • 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_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 18204 bytes
SHA-256: 1f0355eb8cc489328d53e33eb5340253110290e8f320dffce9afb15d083e62b1
font_02_sfnt_off00013c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C03 10444 bytes
SHA-256: 1e580792287ec5a2b66da65d1083559e957d8953dbe8f32648bf1cfa88c3c87e
font_03_sfnt_off000153b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B4 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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