Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba40501abd126ed7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 03:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5261dbb6189d472270c19099923e4c8a SHA-1: cacd72a1b2702a61b308042192b910b6715171e2 SHA-256: ba40501abd126ed7b458e9077ebce583fcbd20ca6b45c21cfa9bb122042a69a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://kolkandkolkdesign.com/site/data/ws/files/80966714310.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/fulevasivetonuwoxesube.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd66c6c15---sujagozisaro.pdfIn PDF document text
    • http://espokebar.com/uploads/files/suxiwarezizufuvijataz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49668432714.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/97d1269d60ef75cb984267e00a4992dc/14902465161.pdfIn PDF document text
    • http://www.bash.cl/media/file/suvidivexoluxivudewuwom.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505afae516c---belibopazitujatizej.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/48095229005.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135122196957---39295844215.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-8/20210908100445821674.pdfIn PDF document text
    • http://toroisg.com/public/images/files/dolanoteti.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vojasimosodujisesikanaw.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/7266018846.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/wadiguwikabavu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/nejevuruxul.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/733a1fd74a19dee759839221c5473754/53877009455.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210921160529903304.pdfIn PDF document text
    • https://naves.cz/res/file/zurela.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/dddueg8401bv8ccudvvhlegcq2/59135627569.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/xotapipulepawadodemetibo.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/lepeluvafiveno.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/xerujuribetuja.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/73205437902.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/88317220451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=facetime+3+way+callsPDF 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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 16568 bytes
SHA-256: b6df3a6ce96d4b8e835f3a7d1b38cfb9a01df7dcd50086da4de6cdb599ae2903
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 10416 bytes
SHA-256: 3031440fcc9cd2a9cda41931c01d7933069290487b24807cc70cc8b37be29fd6