Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4bf83ff6340b16…

MALICIOUS

PDF

92.8 KB Created: 2021-08-09 19:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 016e1ebd3064d90bd0c1d2a0528f97fc SHA-1: 649bcf0c158f61b8b5a206f674c709575c7055fe SHA-256: 1b4bf83ff6340b16a73ea3173873d1c28a570c04461e5277c292acca38e5789a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://terezmisszio.eu/files/file/44235169744.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/81lfoli7seb16fbb4hfj12ld8c/70140777326.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/84563219855.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/fabccf4c36278b9569a34ab21302b375/tukamem.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6qt9fi0ls04o1ldeeu9g30b3h0/54284493076.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2551cd997---89890597326.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/73258549294.pdfIn PDF document text
    • http://nova-auto.com/upload/fuwexelax.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27f163f5328775e212e437b1be293231/gemetokirefenuniwebemofi.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/85576534881.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9014c1f18941dc1dad9af1f589d8f80a/60509298886.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c144d6082---wusonofu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h9toubche11vs0eiue5cm318bq/zobixozugodifefov.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdecede005---xukerukewemubelulafasil.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043d9a103a5---50701635695.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f0a5064a---17694186933.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/94235426559.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c2510ef2c9b2dc35b2752940490a2e72/5062486593.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/3092943787.pdfIn PDF document text
    • http://klefmarken.se/upload/file/55541186654.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/rosula.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efbad646f6---62017936596.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/rexudewixeburigibaxofona.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/japuledexavike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mantoux+test+positive+results+imagesPDF 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_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 17944 bytes
SHA-256: 3a0ab0b0b7cd8fbb52273515c080554c34f9eaf7b7fa5d98d91881a0f76e534d
font_01_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 10856 bytes
SHA-256: 47887b8bb1eec5301b756128f9597aa9d9d3d4391bf8d398638fb8b584e5692d
font_02_sfnt_off00014c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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