Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13a121cebd0e0d2…

MALICIOUS

PDF

73.8 KB Created: 2021-06-29 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e248ee83291fd0609af2220f00ce2a3 SHA-1: 07bb70e6a5d5073485ccb9916e033f3c98c01b2b SHA-256: a13a121cebd0e0d2ec7a52134516879687bddac2f1911a99d0fa8e7efb6283ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and 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. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607442543b2ba---55034609102.pdf
    • http://vitanova-cattery.com/upload/file/robifezinerafa.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f71e57842---refaban.pdf
    • https://augsburger-dartliga.de/uploads/file/fugovi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92df9b956---71530196519.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb83a6e10---14562445643.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160892bf2d7f7a---giliradudesunezutubirixal.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c0286e66937a3aa09efbefa7600750c0/sarojogawujizifi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081315373366---jogupetaga.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca03435ad49---lidonedu.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f6f6666f---26170593634.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c356b60e---sabuwesabefarubidav.pdf
    • http://premium-h.info/files/files/40859325272.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e3c4cd0f---xozuxisiz.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/80vvf2uu63aa5sjk75sb7mknfc/gevexakabinof.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9b477312a07f269f0246a552330d725f/vuteromebogu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b399dfb2762---43986458704.pdf
    • https://aneri12.cz/res/file/muduruwepuxekomunaxuk.pdf
    • http://omni-links.com/images/blog//file/labonijemanukegeb.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607280809def5---fuzin.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1843247981---37962342544.pdf
    • http://kozelskadm.ru/files/uploads/files/rebis.pdf
    • https://africanresearchcenter.com/userfiles/file/79393177907.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215142018304715.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ravenstein%27s+laws+of+migration+definition
    • 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_off0000be87.bin
d539b99be7cbfe0fc85eaf3baefb23af48f9c12dc8312115d3e90eca2ab0c035
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 16272 bytes
font_01_sfnt_off0000e8ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
font_02_sfnt_off000100c5.bin
7a96ef3348f1a5486ccb58272501de6db7c36ee157958abde358c91958950065
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10928 bytes