Malicious PDF — malware analysis report

Static analysis result for SHA-256 41100f817490c928…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 01:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 68bedac988a6521e30ee452dd70c90bd SHA-1: 616a62f1929485cd9bc2ab011f294615d61cd9b2 SHA-256: 41100f817490c928d1ec50b428e4134eaa2c1a710aecbd71fc0108cba28a6283
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or download further payloads. The presence of multiple links on disposable hosting and the use of UTM parameters further support a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ba96f57d---39962489916.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f841f1daec4fc93175fa2ef2f9c8aed/davatiwulete.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/70726213811.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/jojowizofovudabuga.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5aa0e973---javutupepofejewelametira.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc71801e7---vuwapipikiluwaxolo.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/purodupusem.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g9d5kq5etd9a53upfj2eh3dq04/99293443530.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/dewavefubizitopidom.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/pajuzefesematoxazitoxo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a436c7e12---zonibum.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607164b812034---5302303452.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cee5c288f---nanigakuledego.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/73657192458.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377054023f---kodijogigukuxeme.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e8567b1b3153f2edce31e883c7785aae/28735457600.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/93357cc10ffb0653ec500f6e7154413e/vutuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=swathi+monthly+novels+pdf+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012d25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D25 18872 bytes
SHA-256: 94945749492551637fbe282f33b84c0394d77c8ec897d5845d907b06b342f25e
font_00_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5540 bytes
SHA-256: 751f803545e2308ca1edc936a157507f898135a281eb0a1d94ea24d7a58fed5b
font_01_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 10864 bytes
SHA-256: 4c67c3617bc1b71170bdca827ec2de6ddb415255fa739b6a4b1b5a2bc7b00337
font_02_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 11576 bytes
SHA-256: 4ed41ce23083262078592dfc06df8de4e601b7f52a97ab3f811e21952741c9b8
font_04_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 3256 bytes
SHA-256: 60619f908a768317ad57c5ef4dc604108705ef2e740ad20a8392328a9c9f134e

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