Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c4d977337959ef…

MALICIOUS

PDF

147.8 KB Created: 2021-07-08 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2caa86116203fdadc8a85bd61ced1c06 SHA-1: 6642b8ff273f5a4d7e5351f53c23bf057b34b613 SHA-256: a2c4d977337959ef1c52fa5c5970f0f6f3c494f1f27cfdf19886ba35345ed45e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5880a9274---ravesozujapiraxezugesowed.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/sc0ln2m5oc1cv1bvd1aullicl7/86359527679.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/611a462347a836814bd5ba2867c871ab/degab.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/25513084205.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/fibadokovaxuzaredeguw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f84f1a073---72993231823.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/molafe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a99e92f7babcc4f6c99ed30c837e2dad/65914974384.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/38550631644.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/cd885dbcf8492b3784dc21e46a088ca0/zomure.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zitivus.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/76731017725.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/zojodevufara.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fe03f051e5cdedb4f3e3179817cd4e8d/gedipoxavixesiboda.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/82401268159.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079364e3cb38---23171018334.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c976f201---ganopelekewiwupewugokopub.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/nufurivokerusak.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/29523440071.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/92703733918.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684806e0bf---xupidisap.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061405345273499.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/vagekajekujujop.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607906538f89b---40900826470.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/daeb6aeab2f7e2b8d531645bf8a7299f/38205838364.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/jubajobeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=50+lbs+in+kgPDF 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_off0001ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBDD 15368 bytes
SHA-256: a900c78ed462d1fa90a3bf0ca273364ed49ab51acf7ce54b5f950473a14e36ab
font_01_sfnt_off0002131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2131B 10060 bytes
SHA-256: 005be51bbbf23a13359f254a4e4e10adcb01fe65e5fe9852d21fda2a3bc79897
font_02_sfnt_off0002297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1