Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57b10d30488a660…

MALICIOUS

PDF

82.2 KB Created: 2021-06-30 03:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34d728fb5ee960dfcad906b138498c0a SHA-1: 4a6532ba955a31e5492464a8ac4c8d6759fe9794 SHA-256: a57b10d30488a660c13c33547b70e32ba44555bebd4f3dca06ad7e610a30fdee
96 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, specifically utilizing form builder plugins for file uploads. These links appear to form a link farm, redirecting to other PDF files hosted on similar compromised infrastructure. The presence of multiple compromised CMS upload links and a link farm on disposable hosting suggests a campaign to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf31d9e9de---55562028091.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dfffc3455---59682170678.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lofelerugazojo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe25badc5d---rimibososukuk.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/i5u9o02q6ulm66iuaj57v28ram/zunerakunoguxeduxode.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/r950u8h31rojksub499fltcfgl/kitivulefifebikeloxideli.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14744ac095---26253525040.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ad416adb---xepalaju.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/e3a8ea241690f3620f2437bc73d06920/pasifosi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210623_6F17CCBC6E77AC8E.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8c5f022f---mutazaxekewi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051811043489.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e16619de---62744583711.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/sofekuxinamolikidubupudaw.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9397afd82f438ba7acfe54661ff27dd8/77529133661.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vizuragis.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/36683970068.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160889c1b6d0e0---61373912339.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/luxufujixu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/oa4dqj81proddiuvk6ipf90fb1/rukoge.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/32e7141c61fc221b60fb3e5d3bd4defe/zisujozojanogijisukeropew.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca174c0b88c---6587653327.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/41352657822.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/urh9l14eoqrstofu9kom8kge7e/lokegejipibipilan.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lru1rjdpcvtsv1piqkss28m213/penizelizusab.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/4387774748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=background+fire+video+downloadPDF 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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16692 bytes
SHA-256: 9447190bb0356b10f1a4dbff264062c5035514830d6d3519b881469b9cda8b16
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 10784 bytes
SHA-256: 1f7edc3063ced59be0ae9aced532c72981cd91cb7448753f420f4c60772a20d6
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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